# Economics 181: International Trade Homework # 4 Solutions

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1 Economics 181: International Trade Homework # 4 Solutions Ricardo Cavazos and Robert Santillano University of California, Berkeley Due: November 1, The nation of Bermuda is small and assumed to be unable to affect world prices. It imports strawberries at the price of 10 dollars per box. The Domestic Supply and Domestic Demand curves for boxes are: S = D = (a) Assume Bermuda is Completely open to trade. What is the equilibrium price and quantity consumed? How much is produced domestically, and how much is imported? Sine they are open to trade, the equilibrium price will be determined by the world market. Therefore, using the Domestic Supply and Demand equations, and recognizing that Import Demand is given by MD = D S = , we get: w = 10 D = = 1010 S = = 60 MD = = 750 (b) Now consider the effect of an import quota of 400 boxes. What happens to the price of strawberries and quantity consumed? The effect of an import quota is to limit imports at exactly 400. Using the import demand equation expressed above, we can solve for new equilibrium prices to be: 400 = q = 0. With this higher price, we can simply go through the same calculations as before to get: D q = = 860 S q = = 460 MD q = = 400 1

2 (c) Who wins and who loses? Discuss consumers, domestic producers, and importers (Be sure to compute the change in their welfare). To answer this, it is useful to look at a diagram. Figure 1: Effect of a Strawberry uota on Bermuda S q = 0 w A = 10 B C D D M = 400 From the figure, the welfare affects caused by the quota are clear. First off, the restricted imports allow domestic producers to sell more strawberries at a higher price of \$0/box. Therefore, producer surplus increases by area A. Consumers have to pay a higher price, so consumer surplus falls by the areas A,B,C, and D. Lastly, importers of the good can buy strawberries at the lower world price of \$10, but sell them for \$0, so they gain the area marked by C. The overall impact is a loss of areas B and D. Calculating the areas for each, we have: A = 1 ( ) 10 = 900 B + D = ( ) 10 1 = 1750 C = = 4000 so the overall welfare loss is: \$1, 750.

3 . Assume California s supply and demand for beef is: D c = S c = (a) Derive and graph California s import demand schedule. If California s agricultural department outlawed purchasing out of state beef to prevent the slaughter of unhappy cows, what would the price of beef be( i.e. what is the price of beef in autarky)? California s import demand schedule is given by demand minus supply whenever price is below the autarky equilibrium price, or MD c = D c S c. This is given by: MD c = Outlawing the purchase of out of state beef is equivalent to the case where there is no import demand, or MD c = 0. From the previous equation, this occurs at = 15. The demand schedule is seen in the following diagram. Figure : Trade Market for Beef Between California and Nebraska XS n 3 MD c 160 (b) Now consider Nebraska, with the following demand and supply schedules for beef: D n = S n = Export supply is determined by excess supply above the autarky equilibrium price in Nebraska, or XS n = S n D n. This is given by: XS n = Again, the absence of trade is equivalent to the case with no excess supply, or XS n = 0. This occurs at = 3. Foreign s export supply is graphed in the above figure. 3

5 We now have all the information to calculate the welfare effects for California. Below we graph the effects in California s market for beef. Figure 3: Effect of tariff on California s Market for Beef t c = w 0 = 11 t n = 10 S a b c d e M = 140 In the above graph, area a represents the gain to producers, areas a, b, c, and d represent losses to consumers, and c and e represent government revenue. Calculating the areas, we get: Overall welfare effects are then given by: D a = ( ) 1 ( ) = b + d = 1 ( ) ( ) = 10 c = ( ) 140 = 70 e = (11 10) 140 = 140 consumers : producers : government : net :

6 FOR EXTRA CREDIT: roblems 1,, 3, and 4 in the Textbook, Chapter Home s demand curve for wheat is Its supply curve is D = S = Derive and graph Home s import demand schedule. What would the price of wheat be in the absence of trade? Import demand is given by the equation MD( ) = S( ) D( ) = The absence of trade is the equivalent to import demand being zero, which happens at =. The graph is seen below. Figure 4: Trade Market for Wheat XS MD 0. Now add Foreign, which has a demand curve D = 80 0, and a supply curve S = (a) Derive and graph Foreign s export supply curve and find the price of wheat that would prevail in Foreign in the absence of trade. Foreign s export supply curve is given by: XS ( ) = S ( ) D ( ) = The absence of trade is equivalent to export supply being zero, which occurs at = 1. The graph is included in the above figure. 6

7 (b) Now allow Foreign and Home to trade with each other, at zero transportation cost. Find and graph the equilibrium under free trade. What is the world price? What is the volume of trade? When they are allowed to trade, there is no distortion in prices so we have a common world price of w = =. In order to find equilibrium, we set import demand equal to export supply giving: MD( ) = XS ( ) w = w w = 1.5 At this world price we have MD(1.5) = XS (1.5) = Home imposes a specific tariff of 0.5 on wheat imports. (a) Determine and graph the effects of the tariff on the following: (1) the price of wheat in each country; () the quantity of wheat supplied and demanded in each country; (3) the volume of trade. The tariff causes a wedge to be placed between prices seen between the two countries, so we now have = + 5. Setting export supply equal to import demand, we get: MD( + 5) = XS ( ) 80 40( + 0.5) = = 1.5 = At these prices production in each country is given by the following: Table 1: uantity of Wheat Supplied and Demanded in Each Country. Supply Demand Home ( = 1.75) Foreign ( = 1.5) The volume of trade is given by: MD(1.75) = XS (1.5) = 10 The effects on the trade market are given in the graph below. 7

8 Figure 5: Trade Market for Wheat with a tariff = 1.75 = 1.5 XS t MD MD 10 (b) Determine the effect of the tariff on the welfare of each of the following groups: (1) Home import-competing producers; () Home consumers; (3) the Home government. Home import-competing producers are better off because they have less foreign competition, which means both price and quantity of good produced domestically increases. Home consumers are worse off because they now have to pay a higher price. The home government benefits in that they now have additional tariff revenue. (c) Show graphically and calculate the terms of trade gain, the efficiency loss, and the total effect on welfare of the tariff. Figure 6: Terms of Trade Gain and Efficiency Loss for Large Country with Tariff S efficiency loss: (b + d) terms of trade gain: e a b c d e M = 10 D 8

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