ࡱ> []Zyc ;bjbj RffK= +++++???8wSd?/rrrw.y.y.y.y.y.y.$824h.+rrrrr.++r/l!l!l!rx++w.l!rw.l!l!n/*+ q7+ c./0/W+hV5V5@+V5++rrl!rrrrr.. rrr/rrrrV5rrrrrrrrr : CHAPTER 10: ARBITRAGE PRICING THEORY AND MULTIFACTOR MODELS OF RISK AND RETURN PROBLEM SETS 1. The revised estimate of the expected rate of return on the stock would be the old estimate plus the sum of the products of the unexpected change in each factor times the respective sensitivity coefficient: Revised estimate = 12% + [(1 2%) + (0.5 3%)] = 15.5% Note that the IP estimate is computed as: 1 (5% - 3%), and the IR estimate is computed as: 0.5 (8% - 5%). 2. The APT factors must correlate with major sources of uncertainty, i.e., sources of uncertainty that are of concern to many investors. Researchers should investigate factors that correlate with uncertainty in consumption and investment opportunities. GDP, the inflation rate, and interest rates are among the factors that can be expected to determine risk premiums. In particular, industrial production (IP) is a good indicator of changes in the business cycle. Thus, IP is a candidate for a factor that is highly correlated with uncertainties that have to do with investment and consumption opportunities in the economy. 3. Any pattern of returns can be explained if we are free to choose an indefinitely large number of explanatory factors. If a theory of asset pricing is to have value, it must explain returns using a reasonably limited number of explanatory variables (i.e., systematic factors such as unemployment levels, GDP, and oil prices). 4. Equation 10.11 applies here: E(rp ) = rf + P1 [E(r1 ) ( rf ] + P2 [E(r2 )  rf ] We need to find the risk premium (RP) for each of the two factors: RP1 = [E(r1 ) ( rf ] and RP2 = [E(r2 ) ( rf ] In order to do so, we solve the following system of two equations with two unknowns: .31 = .06 + (1.5 RP1 ) + (2.0 RP2 ) .27 = .06 + (2.2 RP1 ) + [( 0.2) RP2 ] The solution to this set of equations is RP1 = 10% and RP2 = 5% Thus, the expected return-beta relationship is E(rP ) = 6% + (P1 10%) + (P2 5%) 5. The expected return for portfolio F equals the risk-free rate since its beta equals 0. For portfolio A, the ratio of risk premium to beta is (12 " 6)/1.2 = 5 For portfolio E, the ratio is lower at (8  6)/0.6 = 3.33 This implies that an arbitrage opportunity exists. For instance, you can create a portfolio G with beta equal to 0.6 (the same as E s) by combining portfolio A and portfolio F in equal weights. The expected return and beta for portfolio G are then: E(rG ) = (0.5 12%) + (0.5 6%) = 9% G = (0.5 1.2) + (0.5 0%) = 0.6 Comparing portfolio G to portfolio E, G has the same beta and higher return. Therefore, an arbitrage opportunity exists by buying portfolio G and selling an equal amount of portfolio E. The profit for this arbitrage will be rG rE =[9% + (0.6 F)] ( [8% + (0.6 F)] = 1% That is, 1% of the funds (long or short) in each portfolio. 6. Substituting the portfolio returns and betas in the expected return-beta relationship, we obtain two equations with two unknowns, the risk-free rate (rf) and the factor risk premium (RP): 12% = rf + (1.2 RP) 9% = rf + (0.8 RP) Solving these equations, we obtain rf = 3% and RP = 7.5% 7. a. Shorting an equally weighted portfolio of the ten negative-alpha stocks and investing the proceeds in an equally-weighted portfolio of the 10 positive-alpha stocks eliminates the market exposure and creates a zero-investment portfolio. Denoting the systematic market factor as RM , the expected dollar return is (noting that the expectation of nonsystematic risk, e, is zero): $1,000,000 [0.02 + (1.0 RM )] ( $1,000,000 [(0.02) + (1.0 RM )] = $1,000,000 0.04 = $40,000 The sensitivity of the payoff of this portfolio to the market factor is zero because the exposures of the positive alpha and negative alpha stocks cancel out. (Notice that the terms involving RM sum to zero.) Thus, the systematic component of total risk is also zero. The variance of the analysts profit is not zero, however, since this portfolio is not well diversified. For n = 20 stocks (i.e., long 10 stocks and short 10 stocks) the investor will have a $100,000 position (either long or short) in each stock. Net market exposure is zero, but firm-specific risk has not been fully diversified. The variance of dollar returns from the positions in the 20 stocks is 20 [(100,000 0.30)2] = 18,000,000,000 The standard deviation of dollar returns is $134,164. b. If n = 50 stocks (25 stocks long and 25 stocks short), the investor will have a $40,000 position in each stock, and the variance of dollar returns is 50 [(40,000 0.30)2] = 7,200,000,000 The standard deviation of dollar returns is $84,853. Similarly, if n = 100 stocks (50 stocks long and 50 stocks short), the investor will have a $20,000 position in each stock, and the variance of dollar returns is 100 [(20,000 0.30)2] = 3,600,000,000 The standard deviation of dollar returns is $60,000. Notice that, when the number of stocks increases by a factor of 5 (i.e., from 20 to 100), standard deviation decreases by a factor of  EMBED Equation.3 = 2.23607 (from $134,164 to $60,000). 8. a.  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  If there are an infinite number of assets with identical characteristics, then a well-diversified portfolio of each type will have only systematic risk since the nonsystematic risk will approach zero with large n. Each variance is simply 2 market variance:  EMBED Equation.3  The mean will equal that of the individual (identical) stocks. c. There is no arbitrage opportunity because the well-diversified portfolios all plot on the security market line (SML). Because they are fairly priced, there is no arbitrage. 9. a. A long position in a portfolio (P) composed of portfolios A and B will offer an expected return-beta trade-off lying on a straight line between points A and B. Therefore, we can choose weights such that P = C but with expected return higher than that of portfolio C. Hence, combining P with a short position in C will create an arbitrage portfolio with zero investment, zero beta, and positive rate of return. b. The argument in part (a) leads to the proposition that the coefficient of 2 must be zero in order to preclude arbitrage opportunities. 10. a. E(r) = 6% + (1.2 6%) + (0.5 8%) + (0.3 3%) = 18.1% Surprises in the macroeconomic factors will result in surprises in the return of the stock: Unexpected return from macro factors = [1.2 (4%  5%)] + [0.5 (6%  3%)] + [0.3 (0%  2%)] =  0.3% E(r) =18.1% " 0.3% = 17.8% 11. The APT required (i.e., equilibrium) rate of return on the stock based on rf and the factor betas is Required E(r) = 6% + (1 6%) + (0.5 2%) + (0.75 4%) = 16% According to the equation for the return on the stock, the actually expected return on the stock is 15% (because the expected surprises on all factors are zero by definition). Because the actually expected return based on risk is less than the equilibrium return, we conclude that the stock is overpriced. 12. The first two factors seem promising with respect to the likely impact on the firms cost of capital. Both are macro factors that would elicit hedging demands across broad sectors of investors. The third factor, while important to Pork Products, is a poor choice for a multifactor SML because the price of hogs is of minor importance to most investors and is therefore highly unlikely to be a priced risk factor. Better choices would focus on variables that investors in aggregate might find more important to their welfare. Examples include: inflation uncertainty, short-term interest-rate risk, energy price risk, or exchange rate risk. The important point here is that, in specifying a multifactor SML, we not confuse risk factors that are important to a particular investor with factors that are important to investors in general; only the latter are likely to command a risk premium in the capital markets. 13. The formula is  EMBED Equation.DSMT4  14. If  EMBED Equation.DSMT4  and based on the sensitivities to real GDP (0.75) and inflation (1.25), McCracken would calculate the expected return for the Orb Large Cap Fund to be:  EMBED Equation.DSMT4  Therefore, Kwons fundamental analysis estimate is congruent with McCrackens APT estimate. If we assume that both Kwon and McCrackens estimates on the return of Orbs Large Cap Fund are accurate, then no arbitrage profit is possible. 15. In order to eliminate inflation, the following three equations must be solved simultaneously, where the GDP sensitivity will equal 1 in the first equation, inflation sensitivity will equal 0 in the second equation and the sum of the weights must equal 1 in the third equation.  EMBED Equation.DSMT4  Here, x represents Orbs High Growth Fund, y represents Large Cap Fund and z represents Utility Fund. Using algebraic manipulation will yield:  EMBED Equation.DSMT4 . 16. Since retirees living off a steady income would be hurt by inflation, this portfolio would not be appropriate for them. Retirees would want a portfolio with a return positively correlated with inflation to preserve value, and less correlated with the variable growth of GDP. Thus, Stiles is wrong. McCracken is correct in that supply side macroeconomic policies are generally designed to increase output at a minimum of inflationary pressure. Increased output would mean higher GDP, which in turn would increase returns of a fund positively correlated with GDP. 17. The maximum residual variance is tied to the number of securities (n) in the portfolio because, as we increase the number of securities, we are more likely to encounter securities with larger residual variances. The starting point is to determine the practical limit on the portfolio residual standard deviation, ((eP), that still qualifies as a well-diversified portfolio. A reasonable approach is to compare (2(eP) to the market variance, or equivalently, to compare ((eP) to the market standard deviation. Suppose we do not allow ((eP) to exceed p(M, where p is a small decimal fraction, for example, 0.05; then, the smaller the value we choose for p, the more stringent our criterion for defining how diversified a well-diversified portfolio must be. Now construct a portfolio of n securities with weights w1, w2,,wn, so that (wi =1. The portfolio residual variance is (2(eP) = (w12(2(ei) To meet our practical definition of sufficiently diversified, we require this residual variance to be less than (p(M)2. A sure and simple way to proceed is to assume the worst, that is, assume that the residual variance of each security is the highest possible value allowed under the assumptions of the problem: (2(ei) = n(2M In that case (2(eP) = (wi2 n(M2 Now apply the constraint: (wi2 n (M2 d" (p(M)2 This requires that: n(wi2 d" p2 Or, equivalently, that: (wi2 d" p2/n A relatively easy way to generate a set of well-diversified portfolios is to use portfolio weights that follow a geometric progression, since the computations then become relatively straightforward. Choose w1 and a common factor q for the geometric progression such that q < 1. Therefore, the weight on each stock is a fraction q of the weight on the previous stock in the series. Then the sum of n terms is: (wi = w1(1 qn)/(1 q) = 1 or: w1 = (1 q)/(1 qn) The sum of the n squared weights is similarly obtained from w12 and a common geometric progression factor of q2. Therefore (wi2 = w12(1 q2n)/(1 q 2) Substituting for w1 from above, we obtain (wi2 = [(1 q)2/(1 qn)2] [(1 q2n)/(1 q 2)] For sufficient diversification, we choose q so that (wi2 d" p2/n For example, continue to assume that p = 0.05 and n = 1,000. If we choose q = 0.9973, then we will satisfy the required condition. At this value for q w1 = 0.0029 and wn = 0.0029 0.99731,000 In this case, w1 is about 15 times wn. Despite this significant departure from equal weighting, this portfolio is nevertheless well diversified. Any value of q between 0.9973 and 1.0 results in a well-diversified portfolio. As q gets closer to 1, the portfolio approaches equal weighting. 18. a. The Fama-French (FF) three-factor model holds that one of the factors driving returns is firm size. An index with returns highly correlated with firm size (i.e., firm capitalization) that captures this factor is SMB (small minus big), the return for a portfolio of small stocks in excess of the return for a portfolio of large stocks. The returns for a small firm will be positively correlated with SMB. Moreover, the smaller the firm, the greater its residual from the other two factors, the market portfolio and the HML portfolio, which is the return for a portfolio of high book-to-market stocks in excess of the return for a portfolio of low book-to-market stocks. Hence, the ratio of the variance of this residual to the variance of the return on SMB will be larger and, together with the higher correlation, results in a high beta on the SMB factor. There seems to be no reason for the merged firm to underperform the returns of the component companies, assuming that the component firms were unrelated and that they will now be operated independently. 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