ࡱ> z @ bjbj bF1DDDX\+\+\+8+\,Xj-d2(22244 4siuiuiuiuiuiui$lRnniD54"455i22j???582D2si?5si??n`,Dc2- Ϊ\+$:a ofj0jaNo<No@cXXNoDc44?4 5444iiXX(\+Z?^XX\+Economics 101 Answers to Homework #3 Spring 2009 Due 03/03/2009 at beginning of lecture Directions: The homework will be collected in a box before the lecture. Please place your name, TA name and section number on top of the homework (legibly). Make sure you write your name as it appears on your ID so that you can receive the correct grade. Please remember the section number for the section you are registered, because you will need that number when you submit exams and homework. Late homework will not be accepted so make plans ahead of time. Please show your work. Good luck! Q1. Tariffs and Quotas The domestic demand and domestic supply curves for CD players in a small closed economy are as follows: Supply: EMBED Equation.3  Demand: EMBED Equation.3  I. Closed Economy (no trade) Calculate the value of consumer surplus (CS) and producer surplus (PS) for the CD player market in this small closed economy. CS = __$50_, PS = __$100_. Solution: Set the supply function and demand function equal;  EMBED Equation.3  Use  EMBED Equation.3  formula to calculate the area of CS and PS (Remember that CS and PS are measured in dollars). CS =  EMBED Equation.3  PS =  EMBED Equation.3  II. Open Economy with Free Trade. Use the following information to answer question a) ~ d). Suppose that this small closed economy is open to free trade and that the world price is $10 per CD player. With free trade, what is the quantity supplied by domestic producers? _4______ Solution: Plug the PWorld = $10 into the domestic Supply equation:  EMBED Equation.3   EMBED Equation.3  With free trade, what is the quantity demanded by domestic consumers? __22__ Solution: Plug the PWorld = $10 into the domestic Demand equation:  EMBED Equation.3   EMBED Equation.3  With free trade, how many CD players will the country import or export? _They will import 18 units__ Solution: At PWorld = $10, Qd = 22, and QsDom =4, there is a shortage of 18 units of CD players, and thus we will need an import = 22 - 4 = 18 units of CD players to fulfill the excess quantity demanded. Calculate the value of consumer surplus (CS trade) and producer surplus (PS trade). CStrade = _$_242_ and PStrade = $_16__. Solution: use  EMBED Equation.3 formula to calculate the area of CS and PS. (Remember that CS and PS are measured in dollars.) CStrade =  EMBED Equation.3  PStrade =  EMBED Equation.3  III. Open Economy with Tariff Use the following information to answer question a) ~ i). Suppose that the government imposes a tariff of $4 on each imported CD player, and the world price is $10 per CD player. What is the quantity supplied by domestic producers after the introduction of the tariff? _____6_______. Solution: Calculate the PTariff = PWorld + Tariff = $10 + $4 = $14. Plug the PTariff = $14 into the domestic Supply equation:  EMBED Equation.3   EMBED Equation.3  What is the quantity demanded by domestic consumers after the introduction of the tariff? ______18________. Solution: Plug the PTariff = $14 into the domestic Demand equation:  EMBED Equation.3   EMBED Equation.3  How many CD players will the country import or export after the introduction of the tariff? They will import 12 units after the imposition of the tariff. Solution: At PTariff = $14, Qd = 6, and QsDom =18, there is a shortage of 12 units of CD players, and thus we will need an import = 18 - 6 = 12 units of CD players to fulfill the excess quantity demanded. Draw a graph and shade the areas of the consumer surplus (CS tariff), the producer surplus (PS tariff), the total tariff revenue (TR tariff), and the deadweight loss (DWL) after the introduction of tariffs.  Calculate the value of consumer surplus (CS tariff) and the value of producer surplus (PS tariff) for the CD player market after introducing the tariff. CS w/Tariff = __$_162___ and PS w/Tariff = __$_36___. Solution: use  EMBED Equation.3 formula to calculate the area of CS and PS. CSTariff =  EMBED Equation.3  PSTariff =  EMBED Equation.3  Calculate the value of total tariff revenue (TR tariff ). Tariff Revenue = __$48__. Solution: total tariff revenue = (tariff per unit)  EMBED Equation.3  (quantity imported) =  EMBED Equation.3 . Calculate the value of the deadweight loss (DWL). DWL = ____$12_____. Solution: DWL is equal to the summation of the two grey triangular areas by using EMBED Equation.3 formula . DWL = EMBED Equation.3  IV. Open Economy with Quota Use the following information to answer question a) ~ j). Suppose that the government introduces a quota allowing imports of 6 units instead of introducing tariffs. Suppose that the world price is $10 per CD player. Given the quota of 6 imported units, find the equation for the new supply curve.  EMBED Equation.3  Solution: Step 1: Find the new supply curve. First of all, we need to construct the new supply curve. At the price below PWorld, no suppliers will import the good since they can simply sell the CD players to other countries in the world at PWorld = $10. Therefore, the quota will only increase the quantity supplied by the quota amount of 6 units at prices equal to or greater than PWorld = $10. 1) P < PWorld = $10 So, we know, for the price under PWorld = $10, the supply equation is equal to the domestic supply equation:  EMBED Equation.3  2) P = PWorld = $10 The supply curve is the horizontal line  EMBED Equation.3  (with a limit of 6 imported units) 3) P > PWorld = $10 For the price above PWorld = $10, the importers are willing to import the quantity up to the quota limit = 6. Therefore, the supply equation above P= $10 is equal to:  EMBED Equation.3  The domestic supply function is  EMBED Equation.3  QQuota =  EMBED Equation.3   EMBED Equation.3  What is the quantity demanded by domestic consumers after the introduction of the quota? ____14____ Solution: Find the new equilibrium price and quantity. By Graph D, we can observe that the demand curve intersects with the new supply curve SQuota at a point above P = $10. Therefore, we shall use the demand curve and the new supply curve SQuota to find the equilibrium point where these two curves intersect. SupplyQuota:  EMBED Equation.3  Demand: EMBED Equation.3  Set them equal,  EMBED Equation.3  Plug  EMBED Equation.3  back to either of the equation, say demand equation,  EMBED Equation.3 , then we get  EMBED Equation.3  The new equilibrium price (Pe) is $18 and the equilibrium quantity (Qe) is 14. What is the quantity supplied by domestic producers after the introduction of the quota? ____8_____ Solution: Plug the new equilibrium price Pe = $18 into the domestic Supply equation:  EMBED Equation.3   EMBED Equation.3  How many CD players will the country import or export after the introduction of the quota? ___They will import 6 units after the imposition of the quota____. Solution: Since the quota only allows the imports up to the limit of 6 units, the imports will be just 6 units. Lets check if this is correct. At Pe= PQuota = $18, Qd = 14, and QsDom =8, there is a shortage of 6 units of CD players, and thus we will need imports = 14 - 8 = 6 units of CD players to fulfill the excess quantity demanded. Draw a graph and mark the new supply curve SQuota with a bold line or a colored line on the graph after the implementation of the quota. Shade the areas of the consumer surplus (CS quota), the producer surplus (PS quota), the license holder revenue (LHR), and the dead weight loss (DWL) after the introduction of the quota.  Calculate the value of consumer surplus (CS quota) and the value of producer surplus (PS quota) for the CD player market after introducing the quota. CS w/Quota = ______$98______ PS w/Quota = ____$64_______. Solution: use area of a triangle =  EMBED Equation.3 formula to calculate the area of CS and PS. CSQuota =  EMBED Equation.3  PSQuota =  EMBED Equation.3  Calculate the value of total license holder revenue (LHR). LHR = _$48_. Solution: total license quota revenue = (PQuota PWorld)  EMBED Equation.3  (Quota) =  EMBED Equation.3 . Calculate the value of the deadweight loss (DWL). DWL = __$48___. Solution: DWL is equal to the summation of the two grey triangular areas using the area of a triangle =  EMBED Equation.3 formula . DWL = EMBED Equation.3  Rank the consumer surplus (CS) for the three options from the highest to the lowest: Option 1: the CD player market without trade. Option 2: the CD player market with free trade. Option 3: the CD player market with the quota. Option 2 (CSTrade = $242) > Option 3 (CSQuota = $98)> Option 1 (CS = $50) Rank the producer surplus (PS) for the three options from the highest to the lowest: Option 1: the CD player market without trade. Option 2: the CD player market with free trade. Option 3: the CD player market with the quota. Option 1 (PS = $100) > Option 3 (PSQuota = $64)> Option 2 (PSTrade = $16) If the government wants to use the quota policy to attain the equilibrium quantity equal to the domestic quantity demanded under the $4 tariff policy in III, what would be the quantity the government sets for the quota to achieve this goal? ___The government should set the quota at 12 units____. Q2. Elasticity I. Price Elasticity of Demand: Buzz demands 20 slices of cheese when the price (P) is equal to 10, while he demands 28 slices of cheese when P=8. a) Elasticity (for part (a) use the simple formula for percentage changes and not the arc elasticity formula) a-1) What is Buzzs price elasticity of demand for cheese (p) at P=$10? a-2) Is Buzz s demand for cheese elastic, inelastic, or unit elastic at P=$10? a-3) What is Buzz s price elasticity of demand for cheese (p) at P=$8? a-4) Is Buzz s demand for cheese elastic, inelastic, or unit elastic at P=$8?  EMBED Equation.3   EMBED Equation.3  b) Calculation of Elasticity using Mid-point method b-1) Now use the mid-point price elasticity method (the same formula as the arc elasticity formula) to calculate Buzzs price elasticity of demand for cheese (p) as the price moves from P0 = $10 to P1 = $8. b-2) According to your calculation in b-1), is Buzz s demand for cheese elastic, inelastic, or unit elastic over this range? Solution: b-1) p = 1.5  EMBED Equation.3  Suppose you are told that Buzz s demand for slices of cheese is Qd = 60  4P. c) Point Elasticity c-1) At price P = $10, what is Buzz s price elasticity of demand (p)? Hint: Use the point elasticity of demand formula to calculate this elasticity. p = __2__. c-2) Is Buzz s demand for cheese elastic or inelastic at price P = $10? ___elastic___ Solution: p = 2. It is elastic at price P = 10 since p = 2>1.  d) Elasticity and Total Revenue d-1) Calculate Buzz s total expenditure on cheese (this would be equivalent to the total revenue (TR) the seller of cheese receives when they sell cheese to Buzz) at P = 10 and at P = 8. When P = 10, TR = __P1*Q1=$10*20=$200____; when P = 8, TR = ___ P0*Q0_$8*28=$224_____. d-2) Does total revenue (TR) increase, decrease, or stay the same when the price decreases from P = 10 to P = 8? ____TR increases______. d-3) Use your calculation of the price elasticity of demand at these two different prices to explain the effect of the price change on total revenue? Since the price is elastic (p = 2 > 1) at P = 10, a decrease in price will cause the total revenue to increase.___ d-4) Given Buzz s demand curve for cheese, at what price is Buzz s price elasticity of demand equal to 1? P = ___7.5___ Solution: P = 7.5  EMBED Equation.3  Now set the two equations equal:  EMBED Equation.3  Alternatively, you know with a linear demand curve that the unit elastic point occurs at the midpoint of the demand curve: in this case the unit elastic point occurs when quantity is equal to 30 units and price is equal to $7.5 d-5) Complete the table below based on Buzzs demand for cheese which is Qd = 60 4P. PQdp  EMBED Equation.3 TR (= P x Qd)0600 0252=4*(2/52)=2/13104444=4*(4/44)=4/11176636=4*(6/36)=2/32167.530=4*(7.5/30)=1225828=4*(8/28)=8/72241020=4*(10/20)=2200150Undefined0 d-6) Suppose Buzz s price elasticity of demand (p ) > 1. When the price increases, does total revenue increase, decrease, or remain unchanged? __Decrease_______. d-7) Suppose Buzz s price elasticity of demand (p ) < 1. When the price increases, does the total revenue increase, decrease, or remain unchanged? __Increase_______. Solution: When the elasticity is smaller than 1, i.e. demand is inelastic, the total revenue increases as the price increases. When the elasticity is greater than 1, i.e. demand is inelastic, the total revenue decreases as the price increases. Notice that when the elasticity is equal to 1, the total revenue is maximized. II. Cross-price elasticity of Demand: Buzz substitutes cheese for potatoes sometimes, but Buzz always drinks whiskey when he has a slice of cheese. The price of potatoes decreases by 10%. As a result, Buzzs demand for cheese decreases from 11 slices of cheese to 9 slices of cheese. a-1)What is the cross-price elasticity of demand for Buzz for these two goods? Hint: for this calculation just use the % change for price you have been given and then calculate the % change in the quantity demanded using the arc elasticity concept. cheese p potato = ____2_____. a-2) From Buzz s perspective, are potatoes a substitute or a complement good for cheese? Why? Use the concept of cross-price elasticity of demand to explain your answer. __Substitute______ The cross price elasticity of demand is 2. Since it is positive, potatoes and cheese are substitutes Solution: cheese p potato = 2. The price of whiskey increases by 20%. As a result, Buzz s demand for cheese decreases by 15%. b-1) What is the cross-price elasticity of demand for Buzz for these two goods? cheese p whiskey = _____ ____. Solution: cheese p whiskey =  .  EMBED Equation.3  b-2) From Buzz s perspective, is whiskey a substitute or a complement good for cheese? Why? Use the concept of cross-price elasticity of demand to explain your answer. _____Complements_____ The cross-price elasticity of demand is . Since this number is negative, whiskey and cheese are complements. III. Income elasticity of Demand: Buzz got a raise at work, and his income increases by 25%. As a result, his wife lets Buzz consume more whiskey and, in addition, his demand for cheese increases by 15%. 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Since this is a positive number, cheese is a normal good for Buzz. b-1) What is Buzz s income elasticity of demand for potatoes? Solution: potatoes income = -2/5.  EMBED Equation.3  b-2) What does this income elasticity tell us about Buzzs valuation of potatoes (are potatoes normal or inferior goods for Buzz)? Buzzs income elasticity of demand for potatoes is (-2/5). Since this is a negative number, potatoes are an inferior good for Buzz. Q3. Nominal vs. Real Prices: Use the following table to answer the next five questions. The CPIs below are constructed using Year 1983 as the base year (BY = 1983). Data Source:  HYPERLINK "ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt" ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt YearCPI (BY= 1983)CPI (BY = 1974)Nominal wageReal wage197450100$61983100200$132006200400$282009210420$28 I. Using the above table of information, recalculate the CPI using 1974 as the base year (BY). Fill in your answers in the third column of the table above. What will be the CPI measure in year 1983 if we alter the base year to 2006? 50. Solution:  EMBED Equation.3  or  EMBED Equation.3  II. What was the increase in the general price level from 1974 to 1983? 100 % . Solution: Change in price level from 1974 to 1983 = EMBED Equation.3  What was the increase in the general price level from 2006 to 2009? 5% Solution: Change in price level from 2006 to 2009 = EMBED Equation.3  If the wage increased at the same rate as the increase in the general price level, given the nominal wage was $6 in 1974, what should the nominal average salary be in 1983? $12. Solution: If the wage increased at the same rate as the increase in the price level from 1974 to 1983, the nominal price of the average salary in 1983 should be = EMBED Equation.3  If the average salary increased at the same rate as the increase in the general price level, given the nominal average wage was $28 in 2006, what should the nominal average wage be in 2009? $29.4. Solution: If the wage increased at the same rate as the increase in the price level from 2006 to 2009, the nominal price of the average salary in 2009 should be = EMBED Equation.3  III. According to the data from the U.S. Department of Labor, the nominal price of the minimum wage was $2 per hour in 1974 and $7.25 in 2009. What was the real price of the minimum wage per hour in 1974 using 2009 as the base year? $8.4 Solution: EMBED Equation.3  IV. Suppose your nominal salary was $40,000 in 2006. You are about to meet with your boss and demand a raise. 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FMicrosoft Equation 3.0 DS Equation Equation.39qF  P 0 =10,Q 0 =20P 1 =8,Q 1 =28a-1)ObjInfoEquation Native _1296766423F]]Ole  p =Q 1 "Q 0 Q 0 P 1 "P 0 P 0 =28"20208"1010=820"210=)25)"15=2a-2)Since   p  = 2> 1,  the demand is elastic  at P = 10a-3) p =Q 1 "Q 0 Q 1 P 1 "P 0 P 1 =28"20288"108=828"28=)27)"14=)87a-4)Since   p  = )87>1,  the demand is elastic  at P = 8 FMicrosoft Equation 3.0 DS EqCompObjfObjInfo!Equation Native "D_1296767546F]]uation Equation.39qF(x P 0 =10,Q 0 =20P 1 =8,Q 1 =28 p =Q 1 "Q 0 )Q 1 +Q 0 2P 1 "P 0 )P 1 +P 0 2=28"20)28+20()28"10)8+10()2=28"2028+208"108+10=848"218=16")19=32=1.5b-2)Since   p  =  1.5> 1,  the demand is elastic. FMicrosoft Equation 3.0 DS Equation Equation.39qOle 4CompObj5fObjInfo7Equation Native 8FÆx7DC Q d =60"4P!P=")14Q d +15 p =1slopePQ()=1")14PQ()=4PQ=1!Q=4P...(1)_1296767656F]]Ole ?CompObj@fObjInfoB FMicrosoft Equation 3.0 DS Equation Equation.39qFG Q d =60"4P...(demand)Q=4P...(1){!60"4P=4P!8P=60!P=608=7.5Equation Native C!_1285626818^F]]Ole HCompObjIf FMicrosoft Equation 3.0 DS Equation Equation.39q3lpi =1slopePQ()()ObjInfoKEquation Native L_1285616894F]]Ole OCompObjPfObjInfoREquation Native S_1285862244F]] FMicrosoft Equation 3.0 DS Equation Equation.39q3‚8T  p =%Q%P="15%20%="34 FMicrosoft Equation 3.0 DS EqOle VCompObjWfObjInfoYEquation Native Zuation Equation.39q&z^,7  p =%Q%P=15%25%=35 FMicrosoft Equation 3.0 DS Equation Equation.39q_1296918560!F]]Ole ]CompObj^fObjInfo`w‚H  p =%Q%P="10%25%="25 FMicrosoft Equation 3.0 DS Equation Equation.39qEquation Native a_1296806028F]]Ole dCompObjefObjInfogEquation Native h_1296806027F]]Ole mP,b CPI 1983(BY=1983) CPI 2006(BY=1983) 100=100200100=50 FMicrosoft Equation 3.0 DS Equation Equation.39qCompObjnfObjInfopEquation Native q_1296919505F]]7DC CPI 1980(BY=1974) CPI 2008(BY=1974) 100=200400100=50 FMicrosoft Equation 3.0 DS EqOle vCompObjwfObjInfoyEquation Native zyuation Equation.39qw]4 CPI 1983(BY=1983) "CPI 1974(BY=1983) CPI 1974(BY=1983) 100%=100"5050100%=100%_1296919598h F]]Ole CompObj  fObjInfo  FMicrosoft Equation 3.0 DS Equation Equation.39qw] CPI 2009(BY=1983) "CPI 2006(BY=1983) CPI 2006(BY=198Equation Native y_1296806358F]]Ole CompObjf3) 100%=210"200200100%=5% FMicrosoft Equation 3.0 DS Equation Equation.39qwxoDR $61+100%()=$61+1()ObjInfoEquation Native _1296806458 F]]Ole =$12 FMicrosoft Equation 3.0 DS Equation Equation.39q‹xn $281+5%()=$281+0.05()=$29.4CompObjfObjInfoEquation Native _1296919469F]]Ole CompObjfObjInfoEquation Native  FMicrosoft Equation 3.0 DS Equation Equation.39qw«(4DC $2CPI 2009 CPI 1974 =$221050=$8.4_1296806799F]]Ole CompObjfObjInfo  FMicrosoft Equation 3.0 DS Equation Equation.39q`2DC $40,000CPI 2009 CPI 2006 =$40,000210200=$42,000Equation Native _1296919183#F]]Ole CompObj"$f FMicrosoft Equation 3.0 DS Equation Equation.39qw· Q d =60"4P!P=")14Q d +15P=10!Q d =60"4(10)=60"40=20ObjInfo%Equation Native 1Table{oSummaryInformation(( p =1slopePQ()=1")141020()=2Oh+'0 $ @ L X dpxEconomics 101Ekel0*"aG}0EHៅ x=H/l!fJqKAX>qDSi9 $g"M YѶIgtts:@BaG 0a^Z#佡 e@`\[ M=PAMM?M$]"Saŋ#>yNbYg@.q@.DbOFzBDa(0 T'bvT Bc{eUHhԉHcLs $Q-b ID9H+wE dQ2+0bJaK A@tAE )|I5֥ 9 H$F= Akf/ 1 ^5>]pg&U5 EprEOeK<4:LD"{hAb 8*@=:|}{C'!! o޼1 ܼ:2A6Ѯ9!'/ȁHʏnU ߇D$wj,\ 9!/BpiuM ndՀ 7<䀼GjtbI#9) " :dfnjFAhn<ĞR $l⭝"rcBد( |`"dV{Ywh 7~㍭:c/=?[:u+EH"@Xho{ Tႈ<1_xc*Tx/" ;|X=GdvFB4>(p=c!a f ݃ܣ2B =AQ Z̄>H{Y{X-); ֊A@ҝ;*D&@,I >/1\%"׺ԣ1"| Nɼ9 "J$Hv?>V#HϤd!FHPg$Hv?>>`,A<ځX'DQ! 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