ࡱ>  ce`abz_7| pbjbj "t_ l@0uuu8@u$v4,zz"zzz{TA$2 RV{{g@@zzgggR@8zzgg`gNjjxz z 6Cdou?^204ͿJg@@@@ Mandated Disclosure and Stock Returns: Evidence from the Over-the-Counter Market Allen Ferrell Harvard Law School Cambridge, MA 02138 JEL: G18, G38, K22 Mandated Disclosure and Stock Returns: Evidence from the Over-the-Counter Market Allen Ferrell* Abstract Mandated disclosure requirements placed on publicly-traded firms constitute the core of U.S. securities regulation. Despite their importance, few empirical studies have been done on the impact of mandated disclosure requirements on the capital markets. Using a unique database created for this study, this paper examines the impact the 1964 imposition of mandated disclosure requirements had on the over-the-counter market in terms of stock returns, volatility and stock price synchronicity. Despite this being the only fundamental change in the scope of mandated disclosure in the U.S. in the twentieth century with the exception of the initial securities acts of the 1930s this regulatory change has never been examined. This study finds that there was a dramatic reduction in the volatility of OTC stock returns associated with the imposition of mandated disclosure. At the same time, there was no change stock price synchronicity associated with mandated disclosure. The evidence on stock returns is inconclusive but suggestive of a positive abnormal associated with mandated disclosure. Mandated Disclosure and Stock Returns: Evidence from the Over-the-Counter Market Allen Ferrell @2003 Allen Ferrell. All Rights Reserved I. Introduction The organizing principle of U.S. securities regulation in the twentieth century is the belief that mandated disclosure of firm-specific information enables capital markets to function efficiently and in the interests of all investors. (Securities Act of 1933; Exchange Act of 1934). The regulatory response to recent corporate scandals has been to focus once again on the presumed importance of full, mandatory disclosure (Sarbanes-Oxley Law, 2002). This regulatory stance, now widely emulated around the world, raises the fundamental question of the role mandated disclosure should play in capital market regulation. Surprisingly, there has been relatively little work attempting to answer this question based on the actual effects of mandated disclosure on the capital markets. The empirical work that has been done, most importantly the studies of the impact of the Securities Act of 1933 and the Exchange Act of 1934 on the financial markets (Stigler 1964; Benston 1973; Simon 1989), has been heavily relied upon by academics in making policy recommendations on the desirability of mandated disclosure (Romano 1998). Unfortunately, these studies suffer from the need to control for changing market conditions over the time period they study (notably the advent of the Great Depression). Moreover, these studies use measures which might not adequately capture the effect mandated disclosure has on how well the capital markets are functioning (Coffee 1984). This paper presents empirical evidence, based on a unique database created for this study, suggesting that mandated disclosure did have a measurable impact. We measure the effect that the imposition of mandated disclosure on the over-the-counter market (OTC), first required in 1964, had on the informational efficiency of that market. Informational efficiency, as used in this paper, refers to the informational content of a security markets prices. An increase in informational efficiency represents an increase in the informational content of securities prices, and, hence, helps ensure that capital allocated based on stock prices is done so more efficiently. It is fair to say that a shortcoming of the empirical literature on mandated disclosure (Stigler 1964; Benston 1973; Simon 1989) has been its relative lack of theory informing its choice of statistical testing. While there are a handful of serviceable theoretical models, the theoretical justification for using particular tests has typically been informal. As a result of this theoretical gap, this paper will use as many as of the proxies for informational efficiency identified in the literature as possible to test the robustness of any findings. In order to measure changes in the informational efficiency of the OTC market, we employ several different proxies for informational efficiency that have been developed in the financial econometric literature (Roll 1988; Simon 1989; Morck et al 2000; Durnev et al 2001a, Durnev et al 2001b). The extension of mandated disclosure to the OTC market represented a fundamental change in the scope of mandated disclosure under U.S. securities law. The only other fundamental change in the scope of mandated disclosure in the twentieth century was the original Securities Acts themselves: the Securities Act of 1933 and the Exchange Act of 1934. These Acts placed extensive mandated disclosure requirements on exchange-listed companies. There have been other changes in the coverage of mandated disclosure requirements over the years, but none of the same fundamental importance as these two. This imposition of mandated disclosure on non-exchange listed securities the OTC market has never been studied. This study has several advantages over earlier studies. First, and most importantly, exchange-listed companies form a natural control group as they were subject to the disclosure requirements of the Exchange Act of 1934 throughout the time period studied (1962-1968). Second, the capital markets in the 1962-68 period did not suffer a shock anywhere near as dramatic as that of the Great Depression. Third, there are theoretical reasons, with empirical backing, for believing that if there were to be effects caused by mandated disclosure on the capital markets, such effects would be most powerfully felt in the less-liquid, less-followed OTC market (Simon 1989). The private market sources of financial information are likely to be less extensive in such a marketplace. In contrast, the New York Stock Exchange in the 1920s, the time period immediately prior to exchange-listed company mandated disclosure requirements, was a well-developed marketplace with deep liquidity. Part II of this paper will provide a brief discussion of the existing empirical literature on mandated disclosure. Part III will then describe the imposition of mandated disclosure by the Securities Acts Amendments of 1964 on the OTC market. The database that was created to study the effect of mandated disclosure on the OTC market will be described in Part IV. Some summary statistics describing OTC firms pre- and post-mandated disclosure are provided in Part V. Part VI then investigates the effect of mandated disclosure on the distribution of abnormal returns both over time and cross-sectionally; two findings emerge from this analysis. First, relative to the listed market, average OTC stock volatility both cross-sectionally and over time fell substantially after the imposition of mandated disclosure. Second, in the post-mandated disclosure period the OTC and listed market behaved in a far more parallel manner than was the case in the pre-mandated disclosure period. A variety of statistical techniques are used in this part to measure volatility, all of which support these two basic findings. The effect of mandated disclosure on stock return synchronicity measures are discussed in Part VII. There was no discernable change in the overall average stock return synchronicity attributable to mandated disclosure. However, the results suggest that there are reasons to believe that average stock return synchronicity measures, which have been used in cross-country studies, are an inappropriate proxy for informational efficiency in this context. On the other hand, the results do indicate that in the post-mandated disclosure period, the OTC and listed markets behaved in a more parallel manner along the dimension of stock return synchronicity. Finally, changes in average and median stock returns resulting from mandated disclosure are examined in Part VIII. Using this measure, mandated disclosure had no clear impact on the OTC market but there is suggestive evidence that there were beneficial effects. II. The Existing Empirical Literature George Stiglers 1964 study marked the first attempt to study the empirical impact of the Securities Acts on the performance of the capital markets. Stigler examined two groups of new share issues: a pre-mandated disclosure group of new share issues (1923-28) and a post-mandated disclosure group of new share issues (1949-55). He found that the returns on securities post-mandated disclosure was the same as that of the pre-mandated disclosure group. Second, he found that the variance of the post-mandated disclosure groups stock returns fell by approximately half. Stigler interpreted these findings as consistent with the view that mandated disclosure had no beneficial effect. In his influential 1973 study, Benston divided New York Stock Exchange (NYSE) companies pre-1934 (pre-mandated disclosure) into two groups: 193 companies which he claims did not disclose sales information and a second group of 314 companies which did disclose sales information even though there was no statutory obligation to do so in the pre-mandated disclosure period. He found that there was little difference between the two groups both pre- and post- mandated disclosure even when employing several different measures. His main result was that the two groups of companies have virtually the same average monthly stock price residuals and the same distribution of stock price residuals throughout both the pre- and post-mandated disclosure period (p.146-147). Carol Simon subsequently reproduced Stiglers result (and confirmed in Benstons study) that there was a substantial reduction in the variance of stock price residuals in the post-mandated disclosure period (Simon 1989). The policy implications of the finding in both the Benston and Stigler study of reduced variance of stock prices (or residuals) has been extensively debated (Seligman 1983; Coffee 1984; Romano 1998; Fox 1999). But there is the threshold question of whether the reduction in variance was caused by the Securities Acts as defenders of mandated disclosure contend (Friend & Westerfield 1975) or resulted from the impact of the Great Depression, as Benston (1975) claims. It is extraordinarily difficult to adjudicate this debate convincingly given the econometric evidence indicating that the Great Depression did have a profound effect on the capital markets, including variance. Simon found, for instance, that the market as a whole experienced a forty-five percent reduction in variance during the Great Depression. (1989, p.309) Conceivably the effects of the Great Depression and the Securities Acts could be disentangled if a good control group were available. Benstons group of 314 companies which purportedly disclosed sales information voluntarily pre-mandated disclosure would arguably serve this function. The problems with using this group as a control are serious however. First, several commentators have noted that many firms in the non-disclosing group of 193 companies did, in fact, disclose basic financial information, such as net income and balance sheet data. (Friend & Westerfield 1975) Second, commentators have argued that the important change wrought by the Securities Acts was primarily in the liability imposed for fraud and non-disclosure given the arguably poor quality of voluntary disclosures even when made (Fox 1999). The increased exposure to liability for inadequate disclosure would have affected both groups of companies. Both these criticisms raise the question of whether measuring the differential effect that the disclosure requirements of the Securities Acts had on Benstons two groups is a good measure of the acts overall effect on the capital markets. If the two groups Benston uses are not all that different, then the differential effect of the Securities Acts on these two groups would not serve as a good measure of the Acts overall effect. The question of how to measure the Securities Acts overall effect highlights the fundamental problem that plagues all econometric studies (Stigler 1964; Benston 1973; Jarrell 1984; Simon 1989) of the Securities Act of 1933 and the Exchange Act of 1934. These studies need to disentangle the effects of the Great Depression on the capital markets from any effect caused by the Securities Acts. It is difficult to do this in a convincing manner. This papers examination of the extension of mandated disclosure requirements to the OTC market in 1964 does not suffer from this problem for the simple reason that there exists a natural control group. The control group is simply the exchange-listed companies which had been subject to the Exchange Acts disclosure requirements for some thirty years, beginning in 1934. Second, although less importantly, the time period of this study 1962-68 does not contain a traumatic stock market event anywhere on the same order as that of the Great Depression. III. The OTC Market and the Securities Acts Amendments of 1964 By the early 1960s the OTC market was a large, important and heterogeneous securities market. It had experienced dramatic growth from the time of the imposition of the Securities Acts in 1933 and 1934, which had largely exempted it from regulation, to the beginning of the 1960s. The OTC market grew from $2.1 billion in sales in 1935 to $38.9 billion in 1961. As a percentage of exchange sales, the OTC market grew from 16% in 1935 to an impressive 61% by 1961. The following graph illustrates this trend.  EMBED Excel.Chart.8 \s  A broad range of different types of securities were traded on the OTC market. The OTC market included most government securities; a large number of bank and insurance companies; industrial companies; and utility companies as well as a wide mix of other types of firms. Some summary statistics on the mix of firms over the course of the 1960s will be presented in Part V. Market capitalizations of OTC companies also varied widely from firms worth less than $100,000 to companies worth billions of dollars. In 1963, the Report of Special Study of Securities Markets, a highly influential and groundbreaking Securities and Exchange Commission (SEC) study of the state of securities regulation, was completed. It reported that ninety-three percent of all the cases of fraud reported by the SEC between January 1961 and July 1962 involved companies that were not subject to the Exchange Acts disclosure requirements. The Report of Special Study also examined approximately 20% of all OTC companies, randomly selected from the OTC market, with an eye to their disclosure practices. It found that twenty-five percent of OTC companies did not disseminate any financial information to shareholders. Of those that did distribute financial data, forty-four percent failed to provide any breakdown of their inventories into categories. Thirty-three percent of firms failed to provide any explanatory notes detailing such important items as depreciation methods, contingent liabilities or long-term contractual obligations. Finally, twenty-three percent of OTC companies did not certify their financial reports. Based on these findings, the Report of Special Study concluded that most OTC companies either make no reports to shareholders at all or their reports are meager and inadequate. (p.10, Part III). The Report found this to be true despite the fact that there were a minority of OTC companies, some of whom were included in its survey of disclosure practices, which had some reporting requirements pursuant to Section 15(d) of the Exchange Act. The Report recommended that the Exchange Acts disclosure requirements be extended to the vast majority of OTC companies. Legislative action quickly followed. On August 20, 1964, the 1964 Securities Acts Amendments were signed into law. The purpose of the amendments, reflecting the analysis and recommendations of the Report, was to afford investors in publicly-held companies whose securities are traded over-the-counter the same fundamental disclosure protections as have been provided to investors in companies whose securities are listed on an exchange (SEC 1964). The 1964 amendments placed on OTC companies the same extensive mandated disclosure requirements as those placed on exchange-listed companies. The amendments added section 12(g) to the Exchange Act of 1934. This section requires OTC companies with more than $1 million in assets and held by more than 750 shareholders to comply with the Exchange Acts periodic disclosure requirements. Section 12(g) does exempt certain types of OTC companies from these requirements. These include investment companies, such as mutual funds, section 12(g)(2)(B), and insurance companies subject to comparable state regulation, section 12(g)(2)(G). Investment companies, although exempt from section 12(g), already had, by 1964, substantial disclosure requirements under the Investment Company Act of 1940. Banks are not exempted from the Exchange Acts requirements, but the administration and enforcement of the disclosure requirements are vested in the federal banking agencies rather than the SEC. The Exchange Acts periodic disclosure requirements, to which OTC companies were subject after the 1964 amendments, include the need to file, pursuant to section 13 of the Exchange Act, the now-familiar panoply of periodic reports: the annual report (form 10-K), quarterly reports (form 10-Q) and when certain specified events occur, a current report (form 8-K). The information contained in these reports includes such items as certified annual balance sheets, acquisition or sale of a significant amount of assets, quarterly cash flow statements and semiannual profit and loss statements. Under section 18 of the Exchange Act, any person who makes a statement in an Exchange Act disclosure document that is false or misleading with respect to any material fact is liable to any person who buys or sells securities in reliance on such a statement and at a price affected by such a statement. In addition to periodic disclosure requirements, the Exchange Acts proxy solicitation and trading regulations were extended to non-exempt OTC companies meeting the threshold requirements of $1 million in assets and a shareholder base of 750. The effective date specified in the statute of the new reporting requirements contained depended on the OTC companys fiscal year. Companies had to comply with the new disclosure requirements within one hundred and twenty days after the last day of its first fiscal year ending after July 1, 1964. Accordingly, the earliest point at which an OTC company was subject to the new disclosure requirements under the statute was November 1, 1964. The SEC, however, granted a reprieve from the statutory deadline allowing companies to file as late as April, 1965 if they so choose. If an OTC companys fiscal year began at the start of the calendar year, that company would be subject to the new disclosure requirements as of May 1, 1965. This study will assume (as was in fact the case) that throughout 1965 the reports required by the Securities Acts Amendments were first filed by OTC firms. The empirical results, however, do not hinge on using this particular date. The results remain the same whether one uses a somewhat different starting point. IV. The Database The Center for Research in Securities Prices database (CRSP) does not include information on the OTC market pre-NASDAQ. As a result, it was necessary to construct a database containing the necessary information on OTC companies. The database contains a number of pieces of information on OTC companies from January 1, 1962 to January 1, 1968. This period covers three years prior to the imposition of mandated disclosure on the OTC market (January 1, 1962 to January 1, 1965) and three years after their imposition (January 1, 1965 to January 1, 1968). The database contains information on companies that were either primary or Eastern OTC companies as of January 1, 1962. The primary and Eastern OTC companies, as designated by the Barrons Statistical Section, were OTC stocks in which there was relatively active trading and had at least 500 shareholders. In contrast, OTC companies in the supplemental section of the Barrons Statistical Section were not as actively traded and did not need to meet the 500 shareholder threshold. Based on data gathered by the Report of Special Study, which counted the number of OTC companies with different shareholder bases (Table IX-C, Part III), approximately 85% of the primary and Eastern companies met the Exchange Acts 750 shareholder threshold with the other 15% having somewhere between 500 and 750 shareholders. It is worth emphasizing that the companies on these two lists are actively traded suggesting that even if a company, at a particular point of time, has somewhere between 500 and 750 shareholders, there is the real possibility that at some other point in time (whether earlier or later) the 750 shareholder threshold would be, at least temporarily, crossed. Once that threshold is crossed, a company is subject to the Exchange Acts disclosure requirements regardless of whether the company knows it crossed the shareholder threshold. Once a company has more than 750 shareholders at a particular point in time, that company is subject to the Exchange Acts requirements unless its shareholder base falls below 300 shareholders. As a result, it would be highly unlikely for a company with actively traded securities and more than 500 shareholders not to comply with the Exchange Acts disclosure requirements and thereby risk running afoul of the Exchange Act. It is therefore reasonable to assume that the remaining 15% of OTC companies would, in reality, be placed under the ambit of the Exchange Acts disclosure requirements. Supplemental OTC companies in the Barrons Statistical Section, in contrast to the primary and Eastern companies, were not included in the database given the lack of any shareholder threshold for qualification on this list. In addition, there are concerns about the accuracy and reliability of the supplemental quotations for these inactively traded securities. The primary and Eastern OTC insurance companies, investment companies and banks were dropped from the database. OTC insurance companies were excluded given their exemption under section 12(g). Investment companies were excluded given their extensive regulation, including mandated disclosure, under the Investment Company Act of 1940. Banks were dropped because of their unique regulatory regime. In addition, all companies which had six or fewer months of returns were also dropped due to the fact that the regression results rapidly lose meaning with so few observations. There were a total of 762 OTC companies as of January 1, 1962 that were neither insurance companies, investment companies or banks and had more than six return observations. For each one of these 762 companies, the following pieces of information was collected for the time period January 1, 1962 to January 1, 1965 (the pre-mandated disclosure period): (1) monthly stock quotations; (2) each companys market capitalization as of January 1, 1962; (3) their standard industrial classification (SIC) code; (4) annual sales; (5) any stock or cash dividends; (6) stock splits; (7) liquidation values for any company that was dissolved; (8) whether (and when) the OTC company became listed on an exchange; (9) identity of any company acquiring (or merging with) an OTC company and whether that company was an OTC or exchange-listed company; (10) quotation, dividend and stock split information on any OTC company that acquired (or merged with) one of the original 762 OTC companies; and (11) bankruptcies. The same information was collected for all primary and Eastern OTC companies that existed as of January 1, 1965 for the time period January 1, 1965 to January 1, 1968 (the post-mandated disclosure period). Excluding insurance companies, investment companies, banks and companies with six or fewer return observations, there were a total of 731 OTC companies as of January 1, 1965. The market capitalization of these OTC companies was measured as of January 1, 1965. The quotation information throughout this time period (1962-1968) was gathered primarily from Barrons Statistical Section. Barrons, in turn, received their quotations from the National Association of Securities Dealers Quotation Bureau. On a few occasions, quotations for a particular company for a specific month would not appear in Barrons primary or Eastern OTC quotation section but a quotation would be provided in its supplemental quotation section. In those cases, the database would include this quotation as the quotation for the stock for that month. A number of OTC companies became listed companies at some point, either through a change in their companys listing or through being acquired by a listed company. These companies returns are included in the database for the time they were traded on the OTC market. In addition to Barrons Statistical Section, quotations were also gathered (and cross-checked) against the Bank and Quotation Record, published by the Commercial and Financial Chronicle, the Standard and Poors Security Owners Stock Guide and the Wall Street Journal. There were ten OTC companies in the 1962-65 time period for which there were some missing quotations. There were twenty-one OTC companies in the 1965-68 period for which there were missing quotations. Dividend (cash and stock) and stock split information was gathered primarily from Standard and Poors Annual Dividend Record. Information regarding name changes, acquisitions/mergers, bankruptcies, liquidations and listings on an exchange came from the Annual Guide to Stocks: Directory of Obsolete Securities. Market capitalization information was available for approximately 90% of the OTC companies and came primarily from the Standard and Poors Security Owners Stock Guide. Some additional market capitalization data came from Moodys Handbook of (Widely Held) Common Stocks. Market capitalization was computed based on outstanding common shares. For a minority of companies outstanding preferred share information was available, but was not used given the small number of companies for which this information was available. Standard industrial classification (SIC) information and annual sales information was available for 562 OTC companies in the 1962-65 period and 561 companies in the 1965-68 period. This constitutes approximately 75% of the OTC companies. This information was gathered from Poors Registry of Directors, Executives and Officers for the years 1962 to 1968. Out of the 762 OTC companies as of January 1, 1962, three had market capitalizations of less than $1 million. For the 731 OTC companies as of January 1, 1965, three companies also had market capitalizations of less than $1 million. Using market capitalization as a proxy for the value of a firms assets, these six companies were dropped from the database given the threshold requirement of $1 million in assets in section 12(g) of the Exchange Act. The control group consisted of all exchange-listed companies, excluding insurance companies, investment companies, banks, and companies with six or less return observations, that had price quotations as of January 1, 1962 and all exchange-listed companies (again excluding insurance companies, investment companies, banks, and companies with six or less return observations) that existed as of January 1, 1965. The control group consists of 1,084 exchange-listed companies that had price quotations as of January 1, 1962 and 1,982 exchange-listed companies that existed as of January 1, 1965. Information for these companies was gathered from the CRSP datafiles. The factor returns used in the Fama-French regressions and the value-weighted market return are from Kenneth Frenchs datalibrary (which is the same as the CRSP value-weighted index). Finally, the risk-free rates of return were provided by Ibbotson Associates, which has computed this return for every month for the time period studied. V. Summary Statistics Table I contains a breakdown of OTC companies in the pre- and post-mandated disclosure periods along a couple of basic dimensions: the number of OTC companies; the number of acquisitions; the liquidations and bankruptcies of OTC companies; the number of OTC companies who change their listing to the listed market; and the average and median market capitalizations of OTC companies. With the exception of market capitalization, the pre- and post-mandated disclosure group of OTC companies look approximately the same. The number of OTC companies as of January 1, 1962 and January 1, 1965 are quite similar: there were 31 more companies (approximately 4% more) in the January 1, 1962 OTC group. As is shown in Table I, there are also similar numbers of acquisitions of OTC firms and liquidations/bankruptcies in the two time periods. Approximately 16.9% of OTC companies list on an exchange between 1962-65 compared to 16.1% for OTC companies in the 1965-68 period. The percentage of OTC firms that became listed firms, either through listing on an exchange or by being acquired by a listed firm, is 20.2% in the 1962-65 period and 20.6% in the 1965-68 period. There is, however, a notable difference in both average and median market capitalizations between the two groups. The average common stock market capitalization of OTC firms as of January 1, 1962 was $39,187,000 and a median of $16,464,000. In contrast, as of January 1, 1965, the average OTC common stock market capitalization was $32,507,000 with a median value of $14,205,000. The same basic differences in market capitalizations remain if one looks just at the group of companies that were OTC companies as of January 1, 1962 and January 1, 1965, suggesting that these differences in market capitalizations are not the result of a different mix of OTC firms in the two periods. The changes in the two-digit SIC industrial classifications of OTC and listed firms are summarized in Table II. A SIC code was included in Table II only if at least 1% of OTC firms were in that industry in either time periods. The SIC codes in Table II cover approximately 90% of the OTC companies for which SIC information was available. As can been seen in Table II, the mix of types of OTC and listed firms by industry remained, on the whole, fairly stable between 1962-65 and 1965-68. The most noticeable difference between the two periods occurred in the electrical and appliances industry classification (SIC 36). While approximately 14% of all OTC firms fell into the electrical and appliances industry classification group in the 1962-1965 period, this percentage fell to approximately 9% in the 1965-68 period. At the same time, the number of listed firms in the electrical and appliances industry classification increased from approximately 6% in the 1962-1965 period to close to 9% in the 1965-1968 period. Given the differences in the mix of industries and market capitalizations between the pre-mandated and post-mandated disclosure period (and the OTC and listed market), these differences will be taken into account in the statistical analysis. VI. Changes in the Distribution of Abnormal Returns This Part of the paper examines the effect of mandated disclosure on the dispersion of abnormal returns both cross-sectionally and over time. Previous econometric studies have looked at the cross-sectional variance of abnormal returns (Simon 1989) and the volatility of stock returns over time (Stigler 1964; Benston 1973) as proxies for informational efficiency. Reductions in the cross-sectional variance and the volatility of stock returns over time have been assumed by researchers to indicate an increase in informational efficiency. Accordingly, Section A will look at the effect of mandated disclosure on the volatility of returns over time while Section B will examine the effect of mandated disclosure on the cross-sectional variance of abnormal returns. Finally, Section C will measure the volatility of the OTC market broken down into above- and below-average performing stocks. The intuitive justification for using the dispersion of returns as a proxy for informational efficiency has essentially been the following: The availability of quality information will [ ] affect the riskiness of [stocks]. As such, the effects of legislation aimed at increasing investor information should be reflected in changes in the dispersion of market-adjusted returns. (p.295). Fortunately, the intuition that the dispersion of abnormal returns should tighten when more firm-specific information becomes available earlier the assumed effect of mandated disclosure requirements does enjoy theoretical support in work by West (1988) and LeRoy and Porter (1981). In these models, the earlier information is available the presumed effect of mandated disclosure if it does have an effect the lower the return volatility as any information about future cash-flows/profits of the firm are more heavily discounted than they would be if the information were revealed later. A. Stock Return Volatility In examining the impact of the Securities Acts of 1933 and 1934 both Benston (1973) and Stigler (1964) measured whether the volatility of monthly stock returns over time decreased after the imposition of mandated disclosure. Accordingly, this section will examine what happens to monthly (abnormal) stock return volatility in the pre- and post-mandated disclosure period. The traditional hypothesis adopted in the literature has been that a lower volatility of stock returns indicates increased informational content. See Fox (1999); Coffee (1984); cf. West (1988); LeRoy & Porter (1981). This assumption about stock return volatility will be revisited in Part VII. The three factors important in explaining stock returns that have been identified by Fama and French (Fama & French 1992; Fama & French 1993) will be used in the course of calculating the abnormal returns of stocks. The three factors are market, book-to-market, and size effects. Each factor represents a variable that has explanatory power in accounting for the cross-section of stock returns. Whether these factors represent sources of undiversifiable risk or market imperfections is an issue of considerable debate (see, e.g., Griffin & Lemmon 2002; Fama & French 1995); one which it is unnecessary to resolve for the purpose of calculating a stocks abnormal return. In addition to the three Fama-French factors, a fourth factor, following Simon (1989), will also be used in calculating abnormal returns. To include the potential impact of changes in the mix of industries on the change in the variance of abnormal returns in the OTC and listed market, the independent variable, RINDt, representing the abnormal return of SIC industry groups, will be used. Let RINDt ( (Rm, t + Rf, t) represent the return on an equally weighted portfolio of firms in a two-digit SIC classification at time t minus the sum of the market return and the risk-free rate at time t. In effect, RINDt ( (Rm, t + Rf, t) captures the return enjoyed by an industry in time t in excess of the market return and risk-free rate. It follows that for any given time period and industry RINDt could be negative as well as positive. The equally weighted portfolio return of firms for an industry was calculated using all the firms in the same market with the same two-digit SIC code for the desired time period. The abnormal return of each stock in each month will be calculated based on a two-step procedure. First, estimates of the coefficients on the three Fama-French independent risk factors Rm, t ( Rf, t, HmLt and SmBt and the industry return variable, RINDt ( (Rm, t + Rf, t), will be calculated for each stock based on either the 1962-65 return data or the 1965-68 return data. Second, these estimates will then be used to calculate an abnormal return for each stock for each month using the estimated coefficients based on the 1962-65 return data for months in this time period and the estimated coefficients based on the 1965-68 return data for months in that period. For instance, the abnormal return for a stock in month t would be Abnormal Returnt = (Rt ( Rf, t) ( (1 * (Rm, t ( Rf, t) - (2 * HmLt - (3 * SmBt - (4 * (RINDt ( Rm, t ( Rf, t) (1) where Rt ( Rf, t is the gross return for that stock in month t minus the risk-free rate. The gross return for a stock includes any dividends (stock or cash) received and are adjusted to take account of any stock splits that occurred during the time period studied. As noted earlier, comprehensive dividend and stock split information was gathered for the OTC stocks from 1962 to 1968. (1, (2, (3, (4 are the estimated coefficients based on that stocks return data for either 1962-65 or 1965-68 depending on which time period month t is in. Based on these abnormal return calculations, the variance of the monthly abnormal returns for each OTC stock in the 1962-65 period was calculated and, then, an average of these variances was taken. The average monthly abnormal return variance was also taken for the post-mandated disclosure period and by year for both the OTC and listed markets. The results are summarized in Table III. Table III presents a clear discontinuity between the pre- and post-mandated disclosure periods for both the OTC and the listed market in terms of the average variances. The average variance for the OTC market fell substantially: from 140.49 on average in the pre-mandated disclosure picture to 90.18 in the post-mandated disclosure period. The yearly average variances also tell the same story of falling volatility beginning with the imposition of mandated disclosure. In 1964 the average OTC variance was 158.23 which fell to 85.19 in 1965, the first year of mandated disclosure. All the yearly OTC variances in the post-mandated disclosure period are substantially lower than any of the average variances in the pre-mandated disclosure years. Moreover, as reported in Section B of Table IV, the OTC Small-Cap companies OTC companies with a market capitalization between $1 million and $10 million dollars likewise experienced a substantial decline in volatility. The average OTC Small-Cap volatility went from 248.11 to 164.99 after the imposition of mandated disclosure. As was the case with the OTC market as a whole, the yearly variances of abnormal returns in the OTC Small-Cap group also show a steep decline starting in the year 1965. The listed market, in sharp contrast, went from an average variance in the 1962-65 period of 33.24 to an average post-mandated disclosure variance of 90.94. All the yearly listed market variances in 1965-68 are sharply higher than any of the yearly listed market variances in the 1962-65 period. In short, the variance of the monthly abnormal returns declined substantially in the OTC market. The conclusion of improved OTC performance is only strengthened when the moves in the OTC variances are compared to what was occurring in the listed market at the same time. Secondly, both the OTC and listed market behaved in a far more parallel manner post-mandated disclosure, whether one looks at post-mandated disclosure variances (an OTC variance 90.18 versus a listed variance of 90.94) or yearly variances in 1965, 1966 and 1967. These differences are statistically insignificant even at the 10% level. These two conclusions are illustrated in the graph provided below where the yearly average variances for the two markets over time have been plotted.  EMBED Excel.Chart.8 \s  Two robustness checks were used to confirm these findings on individual stock volatility. First, an alternative method of calculated abnormal returns was used. Stephen Brown and Jerold Warner (1980) have shown that net-of-market returns (stock return minus the market return) often accurately capture abnormal returns in a wide set of circumstances. Accordingly, for each stock in every month, the difference in the stocks return minus the overall market return is treated as the abnormal return for that stock in that month. The value-weighted market index is used as the market return. The average variances, by period and year, are reported in Section B of Table III. The net-of-market calculations confirm the preceding analysis based on the four-factor model. As a second robustness check, the predicted conditional variances of individual stocks for each month were calculated using a standard GARCH (1,1) model. The GARCH (1,1) model predicts the variance of an individual stock in an upcoming period by utilizing the fact that stock volatility is autocorrelated. In the graph below the monthly individual stock variances predicted by the GARCH (1,1) are averaged and plotted across time.  EMBED Excel.Chart.8 \s  As the graph illustrates, and Table V confirms, the predicted conditional variances over time decrease substantially for the OTC market starting in the post-mandated disclosure period. During the same time, the listed market experienced a substantial increase in the predicted conditional variance in the post-mandated disclosure period. Finally, the OTC and the listed market behaved in a far more parallel manner post-mandated disclosure. The average predicted conditional variances for the years 1965-68 are quite close, in contrast to the 1962-65 period. B. Cross-Sectional Variance of Stock Returns Following Simon (1989), the hypothesis will be that the effect of mandated disclosure, if it is having a beneficial effect, is to reduce the dispersion of OTC companies abnormal stock returns. If mandated disclosure increased the informational efficiency of the OTC market, the assumption is that there should be a reduction in the variance of the abnormal return distribution post-1965 compared to the pre-1965 period for OTC stocks, controlling for changing market conditions. Abnormal returns are calculated for each company in the OTC market. There are 759 companies in the 1962-1965 group and the 728 companies in the 1965-1968 group. In section 1, only the three Fama-French factors will be used in calculating the abnormal returns. In section 2, the industry return variable and yearly time dummies will be introduced. Changing market conditions over the time period studied, 1962-1968, will be controlled for using a control group. The control group consists of 1,084 exchange-listed companies for the 1962-65 period and 1,982 exchange-listed companies for the 1965-68 period. Listed companies were subject, throughout this period, to the Exchange Acts disclosure requirements. 1. Fama-French Three-Factor Model The three-factor model for a stock is estimated by: (Rt ( Rf, t) = ( + (1 * (Rm, t ( Rf, t) + (2 * HmLt + (3 * SmBt + (t (2) where Rt ( Rf, t is the gross return to a stock in month t minus the risk-free rate, and the independent variables Rm, t ( Rf, t, HmLt, SmBt are, as before, the month t returns to zero-investment factor-mimicking portfolios designed to capture risk-adjusted market return, book-to-market ratio, and firm size effects on stock returns. The abnormal return the deviation of the stocks performance from the three-factor model is the intercept term ( for the time-period in question. After calculating the abnormal returns using the three-factor model, the variance of abnormal returns for the OTC and listed market were computed for both the pre- and post-mandated disclosure periods. In the pre-mandated disclosure period, the variance of abnormal returns in the OTC market was 16.57, while the variance in the post-mandated disclosure period was 14.01. The difference between these two variances, using a Goldfeld-Quandt test, was statistically insignificant even at the 10% level. At the same time, however, the variance of abnormal returns increased dramatically in the listed market between the 1962-65 and the 1965-68 time periods: from 4.67 to a variance of 10.32. This change in the listed markets variance of abnormal returns is significant at the 1% level. The difference-in-difference estimator of the relative changes in the listed and OTC market is 8.21. Finally, the difference in variances between the OTC and listed markets variances in the pre-mandated disclosure period was highly statistically significant (at the 1% level) while the differences in variances between the OTC and listed market in the 1965-68 period was far smaller and significant only at the 10% level. There are two interesting aspects to these findings: First, using the listed market as a control group, mandated disclosure appears to be associated with variances in the OTC market that are lower than would have otherwise occurred. Second, the variances of abnormal returns in the OTC and listed market appear to behave in a far more parallel fashion after the imposition of mandated disclosure. These findings, however, do not take into account the differences in the mix of industries between the listed and OTC market and over time. The next section will now do so. 2. Effect of Industry Mix on Abnormal Returns Although the mix of OTC and listed companies by industry remains, on the whole, relatively stable between the two time periods, the breakdown by SIC classification is not identical. For the approximately 75% of OTC companies for which SIC information was available 562 out of 759 OTC firms in 1962-1965 and 561 out of 728 OTC firms in 1965-1968 the regression using the industry return variable, as well as the three Fama-French factors as independent variables, was run. In addition, following Simon (1989), yearly time dummies are also included to capture the effect of the time-specific component of returns. The four-factor model with yearly time dummies is: (Rt ( Rf, t) = ( + (1 * (Rm, t ( Rf, t) + (2 * HmLt + (3 * SmBt + (4 * (RINDt ( Rm, t ( Rf, t) +  EMBED Equation.3 ((j,t * Dj, t) + (t (3) As before Rm, t ( Rf, t, HmLt ,SmBt are the Fama-French factor returns, while Dj,t are yearly time dummies where j equals 2 when t equals months 12 to 24 (year 2) and j equals 3 when t equals months 24 to 36 (year 3). The first year is the baseline year in the model. Accordingly, the abnormal return for a given year for a particular firm is the intercept term ( plus the time dummy coefficient for that year. Likewise for the listed companies the independent variable RINDt and yearly time dummies were included as independent variables in addition to the three Fama-French factors in calculating abnormal returns. As can be seen from Table II the mix of industries among listed companies also changes over the 1962-1968 time period although not dramatically. The results using the four-factor model with yearly time dummies are summarized in Section A of Table VI. Once industry effects are controlled for, the variance of abnormal returns is substantially lower than that found using the three-factor model for the OTC market in both the pre- and post-mandated disclosure period. As can be seen from Table VI, the OTC markets pre-mandated disclosure variance is 11.48 (compared to 16.57 estimated earlier) and its post-mandated disclosure variance is 9.31 (compared to 14.01 estimated earlier). This reduction in variances in the OTC market is statistically significant at only the 10% level. The listed markets variances are also lower than the ones found earlier, although only modestly so: 4.56 for the 1962-65 period and 9.80 for the 1965-68 period. While the variances are lower when industry effects and time dummies are included in the regressions, the same two basic findings found before using the three-factor model remain. First, relative to the listed market, the OTC market performs better in the post-mandated disclosure period; the difference-in-difference estimator is 7.40. Second, the two markets perform in a far more parallel fashion in the post-mandated disclosure period; the variances between the OTC and listed market in the post-mandated disclosure period are statistically indistinguishable (even at the 10% level). These two basic findings are confirmed if one looks at the yearly estimated variances of the two markets summarized in Section B of Table VI. There is no obvious trend in the yearly variances of the OTC market over the 1962-68 period. On the other hand, all the yearly variances of the listed market in the 1965-68 period are substantially higher than any of the yearly variances in the 1962-65 period. In other words, relative to the listed market, the OTC market performed better in the post-mandated disclosure period. Secondly, the yearly variances of the OTC and listed market in the 1965-68 period are, on the whole, quite similar. The same cannot be said for the 1962-65 period. 3. Effect of Market Capitalization on Abnormal Returns It is possible that the imposition of mandated disclosure had a distinct and especially powerful effect on the smallest OTC companies. These are companies for which there might have been very limited private market sources of information. Moreover, only companies with $10 million or more in assets, during this time period, were eligible for listing on the New York Stock Exchange. OTC Small-Cap companies had no choice but to trade on the OTC market. Accordingly, the OTC market was subdivided into those companies with market capitalizations of less than $10 million (OTC Small-Cap). There were 181 OTC Small-Cap in the 1962-65 period and 205 OTC Small-Cap for which there was two-digit SIC information available in the Security and Poors Security Owners Stock Guide or Moodys Handbook of (Widely Held) Common Stock. Section A of Table IV summarizes the findings concerning the variance of OTC Small-Cap firms by year and by pre- and post-mandated disclosure using the four-factor model. As can be seen from this Table, limiting ones attention to the OTC Small-Cap companies does not change the findings concerning the variance of abnormal returns discussed earlier. While the period variances are higher for the OTC Small-Cap group in both the pre- and post-mandated disclosure period (15.93 and 13.97, respectively) than was found for the OTC market as a whole (11.48 and 9.31, respectively), there is no statistically significant difference in the variance of abnormal returns for the OTC Small-Cap group pre- and post-mandated disclosure replicating the result found for the OTC market as whole. Nor do any differences appear between the pre- and post-mandated period when one looks at the variance of OTC Small-Cap abnormal returns by year. And as before, relative to the listed market, the OTC Small-Cap firms performed significantly better and more closely paralleled the listed market in the post-mandated disclosure period. C. Volatility of the Market Average individual return volatility (Section A) and the overall cross-sectional variance of abnormal returns (Section B) might not capture satisfactorily what is occurring in terms of how the overall distribution of abnormal returns in the OTC and listed market are changing over time. Accordingly, for each month, the abnormal returns were divided into one of seven groups based on their relative size: the bottom 5%, 10%, 25% of abnormal returns, the median return, and the top 5%, 10% and 25% of abnormal returns. The values of the abnormal returns at these percentile cut-offs for the OTC market for each month from 1962 to 1968 is summarized in the chart below. For example, the value for the 5th percentile in the OTC market for January, 1962 is the abnormal return of the company that has only five percent of OTC firms with larger negative abnormal returns in that month. The black line represents the beginning of the mandated disclosure period in the OTC market.  EMBED Excel.Chart.8 \s  As the graph indicates, the behavior of the different percentile groups appears to be roughly the same over time with the possible except of the 5th percentile (the bottom five percent of companies) and the 10th percentile group (the bottom ten percent of companies). The 5th and 10th percentile groups appear, on average, to move closer to zero in the post-mandated disclosure period. In other words, there are fewer stock blow-ups in the OTC market post-mandated disclosure. To test rigorously whether the distribution of abnormal returns in these different percentile groupings changed pre- and post-mandated disclosure, the thirty-six cut-off values of each percentile group in the pre-mandated disclosure period where compared to the thirty-six cut-off values of the same percentile group in the post-mandated disclosure period. Given the relatively small sample size (72 observations for each percentile group over the 1962-1968 period), a non-parametric K-sample test on the equality of medians was used to determine whether the median value of a percentile groups thirty-six cut-off values in the pre-mandated disclosure period was statistically different from that percentile groups median value of cut-off values in the post-mandated disclosure period. The results of this analysis are summarized in Section A of Table VII. There were two statistically significant changes, at the 1% level, in the median values in the post-mandated disclosure period: the OTC companies at the bottom 5% and the OTC companies in the bottom 10%. In both groups, the median abnormal returns were closer to zero than in the pre-mandated disclosure period. All the rest of the median values of the percentile groups remained statistically identical, even at the 10% level, in the pre- and post-mandated disclosure period including, interestingly, the median abnormal return for the OTC market. It is useful at this point to compare the OTC market to what was happening in the listed market contemporaneously based on the breakdown of firms into the same percentile groups. As before, the four-factor model the three Fama-French factors and the industry return variable with yearly time dummies will be used to calculate abnormal returns. The results of such an analysis are graphically represented below.  EMBED Excel.Chart.8 \s  In contrast to the OTC market, there is a noticeable change in the distribution of abnormal returns in the post-mandated disclosure period for all the percentile groups with the lone exception of the overall median value. This impression is confirmed when the median values of the cut-off values of the different percentile groups are compared pre- and post- mandated disclosure. Using, as before, a non-parametric K-sample test on the equality of medians, the median values of all percentile groups, except the overall median value, were different in the post-mandated disclosure period with statistical significance at the 1% level. All values were significantly further away from zero than they were in the pre-mandated disclosure period. Prior to 1965 most abnormal returns, as captured by these percentile groupings, varied somewhere between 10% and +10%. After 1965, abnormal returns varied in the significantly broader range of roughly 15% to +15%. As a look at the OTC graph and Table VII will confirm, the listed market in the post-mandated disclosure period started performing more like the OTC market in which abnormal returns typically vary somewhere between 15% and +15% throughout the 1962-1968 time period. In short, even after controlling for differences in firm size, industry, book-to-market ratios and overall market fluctuations, the OTC market after the imposition of mandated disclosure experienced some tightening of the distribution with respect to the worst performers, the bottom 5% and bottom 10%. At the same time, the listed market was experiencing a significant, and systematic, increase in the dispersion of abnormal returns, rendering it more like the OTC market. VII. Changes in Stock Return Synchronicity Research by Morck et al (2000) suggests that the informational content of security prices is inversely related to the degree to which stocks move together (the degree of stock return synchronicity). If mandated disclosure improved the informational content of OTC stock prices, then the hypothesis is that the stock return synchronicity of the OTC market should fall. On a related note, firm-level volatility volatility not explained by broader market fluctuations should increase if mandated disclosure improves stock price accuracy (Durnev et al 2001b). This Part will use the two stock return synchronicity measures employed by Morck et al (2000): the co-movement of stocks and the R2 (explanatory power) of asset pricing models. Moreover, this Part will also provide estimates of the average firm-level volatility (volatility not attributable to broader market movements) in the listed and OTC market pre- and post-mandated disclosure. Co-Movement of Stocks The first straightforward measure of stock return synchronicity is based on the co-movement of stocks. (Morck et al 2000). The stock return synchronicity of a market for any given month, based on the co-movement of stocks, is the number of stocks that move up (if that number is greater than the number that move down) or the number of stocks that move down (if that number is greater than the number that move up) divided by the total number of stocks that move either up or down that month. Accordingly, the co-movement measure of stock return synchronicity, call it f, will lie somewhere between .5 and 1. The f for both the listed market and the OTC market are estimated for each month. Stocks whose prices did not change have been dropped from the calculation of f to avoid possible bias due to non-trading. The results are summarized graphically below. The black line once again represents the first month of 1965, the beginning of the mandated disclosure period.  EMBED Excel.Chart.8 \s  If one confines ones attention to the period immediately surrounding the imposition of mandated disclosure, the changes in the OTC markets co-movement mirrors quite closely the changes in the co-movement of the listed market. In both the listed and OTC market there was, in the immediate aftermath of the imposition of mandated disclosure, a decrease in the co-movement of stocks. As the graph illustrates, throughout the post-mandated disclosure period the OTC market mirrored more closely the changes in co-movement experienced by the listed market than was the case in the pre-mandated disclosure period. The correlation coefficient of the co-movement in the OTC market and the co-movement in the listed market was .83 in the pre-mandated disclosure and an impressive .92 in the post-mandated disclosure period. Table VIII contains the average co-movement of stocks both by year and for 1962-65 and 1965-68 time periods. The average co-movement of stocks in the OTC market in both the 1962-65 period and the 1965-68 period was .63. The listed market experienced a slight decrease in co-movement, from .68 to .66. Accordingly, if one were to use the co-movement of stocks as a proxy for informational efficiency, one could not conclude that the OTC market became more informationally efficient as a result of mandated disclosure. At the same time, given the substantial increase in the correlation coefficient, the OTC market did mirror more closely the behavior of stocks in the listed market. B. R2 and Firm-specific Variation The R2 measure of stock return synchronicity was originally explored by Roll (1988) and developed by Morck et al (2000). The R2 measure calculates stock return synchronicity by the extent to which the returns of a stock can be accounted for (explained) by broader market fluctuations. Recent empirical research has indicated that R2 is economically meaningful. Firms with high R2 stocks invest capital less efficiently than their low R2 firm counterparts. (Wrugler 2000). On a related note, R2 is also inversely related to a stocks informational content. High R2 stocks impound less information about the companys future earnings than low R2 stocks. (Durnev et al 2001b). Finally, as the U.S. stockmarket has developed over the last forty years, there has been a decline in the average R2 of U.S. stocks (Campbell et al 2001). The same findings have also been found to hold true for stocks with high levels of firm-specific variation; stock variation unexplained by broader market fluctuations (Durnev et al 2001b). Stocks with high levels of firm-specific variation have been found to have more information impounded into their price than stocks with lower levels of firm-specific variation. The R2 measure of stock return synchronicity is based on the four-factor model with time dummies used earlier (see equation 3). Following Morck et al (2000), the stock return synchronicity of the OTC and listed markets based on R2 will be measured in two ways: (1) the average (adjusted) R2 of stocks in the OTC or listed market for a given period of time; (2) a weighted average of the (adjusted) R2 in the OTC or listed market for a given period of time, where adjusted R2s are weighted by individual firm volatility. In the second measure, the average will therefore be calculated in the following way:  EMBED Equation.3  (4) where Ri2 and SSTi are, respectively, the (adjusted) Ri2 and sum of squared total variation of stock i. The higher the R2 the more stocks move together in a synchronized manner in that market. The average (unweighted and weighted) in the pre- and post-mandated disclosure periods is reported in Table IX. As with the market co-movement measure of stock return synchronicity, one cannot conclude that mandated disclosure improved the informational efficiency of the OTC market vis-a-vis the listed market. While the unweighted R2 of the OTC market decreased for .33 to .28 (statistically significant at the 1% level), the listed market also experienced a 1% statistically significant decline from .41 to .31. The changes in the weighted R2 in both the OTC and listed market pre- and post-mandated disclosure were statistically insignificant even at the 10% level. At the same time, the estimates of the listed and OTC unweighted and weighted R2 are far closer post-mandated disclosure. The same pattern emerges when one looks at the average firm-specific variation (variation left unexplained by the four-factor model). The average firm-specific variation increased from .54 to .56 in the OTC market, while the average firm-specific variation in the listed market increased from .48 to .56, although neither change is statistically significant at even the 10% level. Post-mandated disclosure, the average levels of firm-specific variation were identical in the OTC and listed market. While the stock return synchronicity literature is clearly an important one, these results do suggest that further refinement and investigation of the stock return synchronicity measures (co-movement of stocks; weighted and unweighted R2s; firm-specific variation) would be useful. For instance, the stock return synchronicity measures all indicate that prior to mandated disclosure, the OTC was more informationally efficient than the listed market a result which is highly implausible and at odds with the findings in Part VI. VIII. Changes in Stock Returns Both Stigler (1964) and Benston (1973) looked at stock returns pre- and post-mandated disclosure as a test for the desirability of mandated disclosure. Stigler reasoned that the purpose of mandated disclosure is to improve shareholder welfare, and, hence, stock returns are a natural place to look to test whether this is, in fact, occurring. Using similar reasoning, Benston argued that if managers were adequately disclosing pre-mandated disclosure, then mandated disclosure might be viewed by investors as imposing a net cost on the firm, which would manifest itself in lower stock returns. The hypothesis in this section will be that if mandated disclosure had a beneficial effect then the period immediately prior to the imposition of mandated disclosure, when the market has already anticipated the change in legal regime, should enjoy positive abnormal returns. The benefits of an improved disclosure regime will be capitalized into stock prices. It is same to assume that such a capitalization would have occurred at some point in the three years, 1962-65, leading up to the implementation of mandated disclosure. Changes in both the median and average abnormal return pre- and post-mandated disclosure were examined. The results discussed below are summarized in Table X. Consider first the median abnormal return. The median value of the thirty-six OTC monthly median abnormal returns in the pre-mandated period was -.01% while the median value of the thirty-six monthly median abnormal returns in the post-mandated disclosure period was actually a bit worse at -.07%. A non-parametric K-sample test of the equality of medians shows that the pre- and post-mandated disclosure median values are statistically identical even at the 10% level. The same equality of the median abnormal returns pre- and post-mandated disclosure also held true for the listed market. The 1962-65 median value of the monthly median abnormal returns in the listed market was -.10% is statistically identical to .25%, the 1965-68 median value of the monthly median abnormal return even at the 10% level. The average OTC abnormal return in the pre-mandated disclosure period was calculated by calculating the average of the abnormal returns of the OTC stocks estimated over the 1962-1965 period using the four-factor model. As before the abnormal return for a firm is the intercept term in equation 3. The average pre-mandated disclosure abnormal return in the OTC market was .26% while the average post-mandated disclosure abnormal return in the OTC market .33%. In the listed market, the average abnormal return in the 1962-1965 period, calculated in the same manner, was .26%, the same as that in the OTC market, and .35% in the post-mandated disclosure period. Using a t-test of averages (assuming unequal variances), the average abnormal return in the OTC market and the listed market in both the pre- and post-mandated disclosure period were statistically identical. The difference-in-difference estimator .02 is statistically insignificant even at the 10% level. These results, it should be noted, are not conclusive as the 1962-65 period might be an insufficiently precise identification of when the market anticipated the change in disclosure requirements. The Securities Acts Amendments became increasingly likely throughout 1963 but was probably relatively unlikely for much of 1962. The average value of the coefficient on the 1963 dummy variable in the three-factor regressions is 1.05 using 1962 as the baseline year. Using yearly dummy variables in the four-factor regressions results in an average value of .19 for the coefficient on the 1963 dummy variable with 1962 as the baseline year. This is suggestive of the fact that there might well have been a positive abnormal return associated with market anticipation of the legal change. Overall, however, the results are not as clear-cut as those regarding volatility. IX. Conclusion This paper has investigated, using a unique dataset created for this purpose, the impact that the imposition of mandated disclosure in 1964 had on the OTC market. Despite the fact that this change was arguably the most fundamental change in the scope of mandated disclosure with the exception of the Securities Acts themselves, it has never been studied. This study does not suffer from having to isolate the effects of the Great Depression from the effects of mandated disclosure. Moreover, changing market conditions can be controlled for as exchange-listed securities had long been subject to mandated disclosure by the time mandated disclosure was first imposed on the OTC market. This paper tests a variety of hypotheses used in the econometric literature to study the effects of mandated disclosure. Different researchers have utilized different hypotheses in the course of analyzing mandated disclosures effects. This paper has attempted to test as many of these hypotheses as is possible given the data available. In terms of stock return volatility, both cross-sectionally and over time, two findings stand out. First, relative to the listed market, OTC stock volatility fell substantially after the imposition of mandated disclosure. The findings with respect to volatility over time are especially dramatic. Second, in the post-mandated disclosure period the OTC and listed market behaved in a far more parallel manner than was the case in the pre-mandated disclosure period. A variety of statistical techniques are used to measure volatility, all of which support these two basic findings. Turning to other proxies for improved informational efficiency, the results are not clear-cut. There is no discernable change in the overall average stock return synchronicity attributable to mandated disclosure. For reasons given in the paper, there are reasons for questioning whether average stock return synchronicity in this context is a good proxy in this setting. The stock return synchronicity findings do indicate, however, that in the post-mandated disclosure period, the OTC and listed markets behaved in a more parallel manner along this dimension. Finally, changes in average and median stock returns resulting from mandated disclosure are examined in Part IX. Using this particular measure, mandated disclosure had no clear impact on the OTC market although there is suggestive evidence that mandated disclosure might have had a beneficial impact. Table I Summary Statistics This table presents a breakdown of the 1962-65 and 1965-68 OTC firms along a couple of basic dimensions. Market capitalization information was gathered from Standard and Poors Security Owners Stock Guide and Moodys Handbook of (Widely Held) Common Stocks. Market capitalization was computed based on the value of outstanding common shares. Information regarding mergers, bankruptcies, liquidations and OTC firms that decide to list on the NYSE, AMEX or some other exchange is from the Annual Guide to Stocks: Directory of Obsolete Securities. OTC 1962-1965OTC 1965-68 Number of Firms 759728 Switch to NYSE-Listing 7261 Switch to AMEX-Listing 5155Other-Listing51Merged with NYSE Firm2532Merged with Amex Firm11Merged with OTC Firm710Liquidations/ Bankruptcies810Median Mkt Capitalization$16,464,000$14,205,000Average Mkt Capitalization$39,187,000$32,507,000 Table II SIC Classification This table presents the percentage breakdown of OTC and exchange-listed firms by their two-digit standard industrial classification (SIC) as of January 1, 1962 and as of January 1, 1965. Companies with six or less observations and financial companies (SIC 60-64 & 67) were dropped. After these companies were dropped, there were 562 OTC companies for which there was SIC information as of January 1, 1962 and 561 OTC companies for which there was SIC information as of January 1, 1965. There were 1,084 exchange-listed companies with SIC information as of January 1, 1962 and 1,981 exchange-listed companies with SIC information as of January 1, 1965. SIC classifications for exchange-listed companies were obtained from the University of Chicago Center for Research in Security Price (CRSP) database. SIC classifications for OTC companies were obtained from Poors Registry of Directors, Executives and Officers. SIC classifications with less than 1% of the OTC and exchange-listed companies were dropped in this table. 1962 OTC Market Firms 1965 OTC Market Firms SICPercentSICPercentSICPercentSICPercent133.38%3614.24%133.92%369.27%204.27%373.03%204.99%372.85%221.60%383.38%221.43%383.39%231.07%392.31%233.03%392.50%262.49%421.78%262.50%421.78%274.09%481.25%273.57%481.07%287.30%4910.50%285.17%4911.05%301.25%503.20%302.14%503.21%323.20%541.78%322.14%541.78%333.56%651.25%333.74%652.50%342.85%731.42%343.74%732.32%359.25%890.72%358.02%891.07% 1962 Listed Market Firms 1965 Listed Market Firms SIC PercentSICPercentSICPercentSICPercent101.77%366.20%102.37%368.79%131.08%376.35%133.59%375.23%207.09%382.86%205.73%382.62%211.14%390.87%211.00%391.40%222.03%403.75%222.23%401.98%231.56%451.14%232.38%451.19%263.00%480.78%262.44%481.41%271.38%499.95%271.40%496.35%287.41%500.78%286.76%501.98%293.02%532.76%292.14%532.53%301.37%541.60%301.72%541.56%323.31%560.88%322.75%561.01%335.95%590.71%334.57%591.37%343.64%650.38%344.02%651.70%358.97%357.46% Table III Variance of Abnormal and Net-of-Market Returns over Time This table summarizes the variances of abnormal and net-of-market returns. Abnormal returns are calculated from a four-factor model with yearly time dummies using book-to-market, firm size, market return in excess of the risk-free rate, and industry average return in excess of the risk-free and market return as explanatory factors using Newey-West (1987) autocorrelation- and heteroskedasticity-consistent standard errors. Based on the four-factor model with yearly time dummies, an abnormal return is calculated for each month for each stock. The variance of abnormal returns is then calculated for each stock by year and pre- and post-mandated disclosure periods. The average of these variances, by time period and market, is reported in Section A. Section B reports the average variance by year and pre- and post-mandated disclosure periods of net-of-market returns. Net-of-market return for a stock is its stock return minus the market return for a given month. The market return is a value-weighted market index as reported in Kenneth Frenchs datalibrary. Stocks with returns greater than (250% were dropped as outliers (for a total of eleven observations). A. Average Variance of Abnormal Returns over Time YearVariance of OTC Market Abnormal ReturnVariance of Listed Market Abnormal Return1962105.6528.831963149.7632.361964158.2338.28196585.1981.33196674.6477.18196792.68104.591962-65140.4933.241965-6890.1890.94 B. Average Variance of Net-of-Market Returns over Time YearVariance of OTC Net-of-Market ReturnsVariance of Listed Net-of-Market Abnormal Returns1962178.8850.421963234.8141.781964240.7747.491965125.12108.371966129.57121.701967179.01145.371962-65226.2947.321965-68156.19128.63 Table IV Small Market Capitalization Results This table displays the variance of abnormal returns for OTC firms with between one and ten million dollars in common stock market capitalization (OTC Small-Cap). Firms in this group had common stock market capitalizations between 1 and 10 million dollars in each period. Common stock market capitalization was collected from Security and Poors Security Owners Stock Guide and Moodys Handbook of (Widely Held) Common Stock. There were 181 such companies in the pre-mandated disclosure period and 205 such companies in the post-mandated disclosure period with SIC information available from Poors Registry of Directors, Executives and Officers. Returns that exceeded (250% were dropped from the data as outliers (for a total of eleven observations). Two types of variances are calculated below: the average cross-sectional variance of abnormal returns using a four-factor model by year (Section A) and the average variance of abnormal returns over time using a four-factor model with time dummies (Section B). Variances in Section B are averaged by year and the pre- and post-mandated disclosure periods. The four explanatory factors are book-to-market, firm size, value-weighted market return in excess of the risk-free rate of return, and the industry return in excess of the risk-free and market returns. All abnormal returns are calculated using Newey-West (1987) autocorrelation- and heteroskedasticity-consistent standard errors. Variance of Abnormal Returns of OTC Small-Cap by Year Time ElapsedPre-Mandated DisclosurePost-Mandated DisclosureF-Statistic (for difference)OTC 1-12 months15.9313.971.14Market13-24 months17.6516.451.0725-36 months18.5822.321.20 Average Variance of Abnormal Returns of OTC Small-Cap over Time YearVariance of Monthly Abnormal Returns1962184.701963254.751964297.441965141.951966133.231967185.211962-65248.111965-68164.99 Table V GARCH Conditional Variances The following table shows predicted conditional variances derived from a GARCH (1,1) model. Conditional variance predictions are based on the four-factor model with time dummies using book-to-market, firm size, market return, and industry average return as explanatory factors. Returns that exceeded (250% were dropped from the data as outliers (for a total of eleven observations). The values below are averages of individual predicted conditional variances generated by the GARCH process. Averages are shown by year and for the pre- and post-mandated disclosure periods. Predicted conditional variance values indicate changes in the structure or composition of abnormal return volatility. A t-test of means assuming unequal variances is used to determine whether the differences of the mean predicted conditional variance values are statistically significant. YearOTC Market Predicted Conditional VarianceListed Market Predicted Conditional VarianceDifference1962149.8066.03-83.77**1963197.1464.20-132.94**1964232.3769.10-163.27**1965133.52100.67-32.85**1966144.77111.61-33.16**1967184.00138.53-45.47**1962-65193.1066.44-126.66**1965-68154.10116.94-37.16** ** Significant at the 1% level Table VI Cross-Sectional Variance of Four-Factor Abnormal Returns This table summarizes the variance of the cross-sectional abnormal returns. Abnormal returns were calculated using book-to-market, firm size, market return, and industry average return over the risk-free and market returns as explanatory factors (Consult Fama & French (1993) on the construction of the first three factors). The sample period is January 1, 1962 to January 1, 1965 (pre-mandated disclosure period) and January 1, 1965 to January 1, 1968 (post-mandated disclosure period). All abnormal returns are calculated using Newey-West (1987) autocorrelation and heteroskedasticity-consistent standard errors. Stocks whose returns exceeded (250% were dropped from the data as outliers (for a total of eleven observations). The Quandt-Goldfield test is used to determine whether the differences in variances are statistically significant. Variance of Abnormal Returns: Pre- and Post-Mandated Disclosure 1962-1965 1965-68 Difference F Statistic OTC Market11.489.31-2.171.23Listed Market4.569.805.242.15Difference 6.91-0.497.40 Variance of Abnormal Returns by Year Time ElapsedPre-Mandated DisclosurePost-Mandated DisclosureDifferenceF-Statistic (for difference)OTC1-12 months11.489.31-2.171.23Market13-24 months16.8716.05-0.811.0525-36 months13.7523.9410.191.74Listed1-12 months4.569.805.242.15Market13-24 months5.5914.078.472.5225-36 months3.8332.2228.398.41 Table VII Median Monthly Abnormal Returns By Percentile Group This table summarizes the distributional changes of the monthly abnormal returns in the pre- and post-mandated disclosure periods. Monthly abnormal returns are derived from a four-factor model (three Fama-French factors and an industry return control) with time dummies. Outliers (defined as stock returns reported (250%) were dropped prior to calculation of abnormal returns (for a total of eleven observations). Section A shows values of various percentile groups of monthly abnormal returns in the pre- and post-mandated disclosure periods. Section B displays the Pearson Chi2 test statistics (both with and without continuity correction) resulting from a non-parametric K-sample test on the equality of median percentile values. Significance in the differences at the 1% level is indicated with two asterisks in Section A. Percentile Values for Monthly Abnormal Returns: Pre- and Post-Mandated Disclosure OTC MarketListed MarketPercentile1962-651965-68Difference1962-651965-68Difference5th-16.20-14.182.02**-8.53-12.92-4.39**10th-10.81-10.030.78**-6.31-9.57-3.26**25th-4.98-4.810.16-3.13-4.79-1.66**50th-0.01-0.07-0.06-0.10-0.25-0.1575th4.694.740.053.194.331.14**90th11.1711.300.136.7710.513.74**95th17.7616.43-1.339.5415.826.29** ** Significant at the 1% level B. Pearson Chi2 Test Statistics for Non-Parametric Test on the Equality of Percentile Cutoff Medians OTC MarketListed MarketPercentilePearson Chi2 ValueContinuity- Corrected Pearson Chi2 ValuePearson Chi2 ValueContinuity Corrected Pearson Chi2 Value5th18.0016.0656.8953.3910th8.006.7250.0046.7225th0.220.0626.8924.5050th0.220.062.001.3975th0.000.0650.0046.7290th0.220.0656.8953.3995th2.001.3956.8953.39Table VIII Market Co-Movement This table presents average market co-movement by year, by period (pre- and post-mandated disclosure), and over the entire six-year span of this study. Market co-movement is calculated by first taking the number of increasing stock returns and dividing by the total number of stock returns with non-zero returns for a given month. A similar fraction is computed with the number of decreasing stock returns in the numerator. The larger of the two fractions (increasing or decreasing) is the market co-movement for that month. The numbers reported below are simple averages of the monthly market co-movement values; larger market co-movement values indicate that stocks in that period moved more closely together than stocks in a period or market with a lower market co-movement value. Average Market Co-Movement YearOTC Market Market Co-MovementListed Market Market Co-Movement19620.710.7519630.610.6719640.560.6019650.630.6519660.630.6619670.640.671962-650.630.681965-680.630.661962-680.630.67 Table IX Stock Return Synchronicity: R2 This table summarizes the average explanatory power the adjusted R2 of a four-factor model of stock returns with yearly time dummies and the average firm-specific variation for OTC and listed stocks. The four explanatory factors are book-to-market, firm size, the value-weighted market return in excess of the risk-free rate, and the industry return in excess of the risk-free and market returns. Unweighted average R2 is the mean of the adjusted R2 for the four-factor model pre- and post-mandated disclosure for a group of stocks (OTC or listed). Differences between the unweighted average R2s is tested for by using a ttest of means assuming unequal variances. The weighted average R2 is the mean of the adjusted R2 for the four-factor model with time dummies weighted by that firms individual volatility (see equation 4). Firm-specific variation is the fraction of a firms total return variance that is left unexplained by the four-factor model with time dummies. The table presents the average firm-specific variation for the OTC and listed market pre- and post-mandated disclosure. Average R2 and Firm Specific Variation 1962-651965-68DifferenceOTC MarketUnweighted R20.330.28-0.05**Weighted R20.290.330.04Firm Specific Variation0.540.560.02Listed MarketUnweighted R20.410.31-0.09**Weighted R20.410.32-0.09Firm Specific Variation0.480.560.07 ** Significant at the 1% level Table X Median and Average Abnormal Returns This table shows the median values of monthly abnormal returns (part A) and the mean values of abnormal returns (part B) for each market in the pre- and post-mandated disclosure periods. The table also shows the appropriate difference values as well as their significance (note that none of the values below are significant at the 10% levels). Significance of the median values is determined by a K-sample nonparametric test on the equality of medians; significance of the average abnormal return is computed using a two-sample t-test of means assuming unequal variances, with standard errors reported in parentheses. Both abnormal returns are based on a four-factor model with yearly time dummies using book-to-market, firm size, market return in excess of the risk-free rate, and industry average return in excess of the risk-free and market returns as explanatory factors. Return values that exceeded  EMBED Equation.3 250% were dropped as outliers (for a total of eleven observations). Median Monthly Abnormal Return OTC Market1962-19651965-1968DifferenceMedian -0.01-0.07-0.06Listed Market1962-19651965-1968DifferenceMedian -0.1-0.25-0.15 Average Abnormal Returns OTC Market1962-19651965-1968DifferenceAverage0.26 (0.024)0.33 (0.021)0.07 (0.032)Listed Market1962-19651965-1968DifferenceAverage0.26 (0.010)0.35 (0.012)0.09 (0.015)Difference-in-Difference Difference0.00 (0.026)-0.02 (0.024)0.02 (0.036) Benston, George, 1973, Required Disclosure and the Stock Market: An Evaluation of the Securities Exchange Act of 1934, 63 American Economic Review 132 Benston, George, 1975, Required Disclosure and the Stock Market: Rejoinder, 65 American Economic Review 473 Brown, Stephen & Warner, Jerold, 1980, Measuring Security Price Performance, 8 Journal of Financial Economics 205 Campbell, John, Lettau, Martin, Malkiel, Burton, and Xu, Yexiao, 2001, Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk, 56 Journal of Finance. Coffee, John, 1984, Market Failure and the Economic Case for a Mandatory Disclosure System, 70 Va. L.Rev. 717. Durnev, Artyom, Fox, Merritt, Morck, Randall, & Yeung, Bernard, 2001a, Law, Share Price Accuracy and Economic Performance: The New Evidence, working paper Durnev, Artyom, Morck, Randall, Yeung, Bernard, and Zarown, 2001b, Does Greater Firm-Specific Return Variation Mean More or Less Informed Stock Pricing?, working paper Fama, Eugene, and French, Kenneth, 1992, The Cross-Section of Expected Stock Returns, 47 Journal of Finance 427 Fama, Eugene, and French, Kenneth, 1993, Common Risk Factors on the Returns of Stocks and Bonds, Journal of Financial Economics Fame, Eugene and French, Kenneth, 1995, Size and Book-to-Market factors in earnings and returns, 50 Journal of Finance 131 (1995). Fox, Merritt, Retaining Mandatory Securities Disclosure: Why Issuer Choice is Not Investor Empowerment, 85 Virginia Law Review 1371 (1999). Friend, Hoffman, Winn, 1958, The Over-The-Counter Securities Markets. Friend, Irwin and Herman, E.S., Professor Stigler on Securities Regulation: A Further Comment, 38 Journal of Business 106 (1965) Friend, Irwin and Westerfield, Randolph, Required Disclosure and the Stock Market: Comment, American Economic Review 467 (1975) Goldfeld, Stephen & Quandt, Richard, Some Tests for Homoscedasticity, 1965, 60 Journal of The American Statistical Association 539 Griffin, John and Lemmon, Michael, Book-to-Market Equity, Distress Risk, and Stock Returns, 57 Journal of Finance 2317 (2002) Jarrell, Gregg, The Economic Effects of Federal Regulation of the Market for New Security Issues, 24 Journal of Law and Economics 613 (1984) Leroy, Stephen, and Porter, Richard, 1981, The Present-Value Relation: Tests Based on Implied Variance Bounds, 49 Econometrica 555-574 Morck, Randall, Yeung, Bernard, and Yu, Wayne, 2000, Informational Content of Stock Markets: Why do Emerging Markets have Synchronous Stock Price Movements?, 58 Journal of Financial Economics 215 Roll, Richard, 1988, R-Squared, 43 Journal of Finance 541 Romano, Roberta, 1998, Empowering Investors: A Market Approach to Securities Regulation, 107 Yale L.J. 2359. Securities and Exchange Commission, The Report of Special Study of Securities Markets (1963) Securities and Exchange Commission, Summary of the Security Acts Amendments of 1964, 1964 LEXIS 101 (September 15, 1964). Seligman, Joel, The Historical Need for a Mandatory Corporate Disclosure System, 9 J.Corp. L. 1 (1983). Simon, Carol, 1989, The Effect of the 1933 Securities Act on Investor Information and the Performance of New Issues, 79 American Economic Review 295 Stigler, George, 1964, Public Regulation of the Securities Markets, 37 Journal of Business 117. West, Kenneth, 1988, Dividend Innovations and Stock Price Volatility, 56 Econometrica 37-61. Wurgler, Jeffrey, 2000, Financial Markets and the Allocation of Capital, Journal of Financial Economics * Assistant Professor of Law, Harvard Law School. I would like to thank Krishna Rao, Robert Schroeder and Rose Zhao for their outstanding research assistance, helpful comments from participants in the American Law and Economics Association Conference, Stanford/Yale Junior Faculty Conference, the Babson Business School Economics Workshop, the Boalt Law and Economics Workshop, the Kennedy Schools New Directions in Regulation Seminar, University of Michigan Law and Economics Workshop, the MIT finance lunch workshop and the Harvard Law and Economics Workshop and helpful comments and conversations from Lucian Bebchuk, Victor Chernozhukov, John C. Coffee, Cary Coglianese, Andrew Guzman, Henry Hansmann, Howell Jackson, Louis Kaplow, Elizabeth Keating and Paul Zarowin. I would also like to thank the Harvard Law School John M. Olin Center for Law, Economics and Business for its financial support.  See Bebchuk & Ferrell, Rational Pricing and the R2 of Stocks, Work in Progress (modeling relationship between informational efficiency and R2)  Residuals were calculated for each companys stock in Benstons study using a market model.  Residuals were calculated for each companys stock in Simons study using a model more sophisticated than the market model, enabling her to take into account effects such as that of firm size on stock prices.  Section 15(d) requires disclosures of companies that issued securities after 1936 assuming that the firms market capitalization exceeded a certain threshold.  Other scholars have had similar intuitions. Merritt Fox, for example, states, Presumably everyone . . . accepts the theoretical proposition that any information that is of value to investors for predicting the future with greater accuracy will lead to less share price dispersion. (1999). See Allen Ferell, If We Understand the Mechanisms Why Dont We Understand the Output?, forthcoming Journal of Corporation Law (2003) for a discussion of these issues.  For every regression in this paper using a four-factor model, we reran the regression using just the Fama-French three-factor model. These regressions have been left unreported, except for Section B.1 of Part VI. In no case did the choice between a three-factor model and a four-factor model affect the findings reported and, hence, are left unreported.  For every regression using the four or three-factor model, coefficient estimates were also calculated using the merged 1962-1968 database rather than estimating the coefficients on 1962-65 and 1965-68. The findings reported in this paper are the same when coefficients are estimated on the merged dataset.  When we looked at volatility and stock price synchronicity the fact that the market might have anticipated the imposition of mandated disclosure was unimportant in constructing the statistical tests. Even if the market anticipated that more firm-specific information would be reaching the market as a result of mandated disclosure prior to 1965, the informational content of securities prices would not have been improved until the firm-specific information was actually released.  In both the four-factor and three-factor regression, the average coefficient value for the 1963 dummy value was actually slightly negative using 1962 as the baseline year. 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