Which Goods Will A Nation Typically Import

Demand and Supply Analysis of International Trade

The theories of comparative advantage and absolute advantage show us that there are overall gains from trade. Trade does have distributional impacts however. These distributional impacts are easier to see if one was to represent free trade in a standard demand and supply framework.

Consider two countries, Brazil and the United States, who produce sugar. Each country has a domestic supply and demand for sugar, as detailed in Table 1 and illustrated in Figure 2. In Brazil, without trade, the equilibrium price of sugar is 12 cents per pound and the equilibrium output is 30 tons. When there is no trade in the United States, the equilibrium price of sugar is 24 cents per pound and the equilibrium quantity is 80 tons. These equilibrium points are labeled with the point E. Notice that in this set-up, Brazil is the low-cost provider of sugar and has the cost-advantage.

Table 1. The Sugar Trade between Brazil and the United States

Price Brazil: Quantity Supplied (tons) Brazil: Quantity Demanded (tons) U.S.: Quantity Supplied (tons) U.S.: Quantity Demanded (tons) 8 cents 20 35 60 100 12 cents 30 30 66 93 14 cents 35 28 69 90 16 cents 40 25 72 87 20 cents 45 21 76 83 24 cents 50 18 80 80 28 cents 55 15 82 78

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If international trade between Brazil and the United States now becomes possible, profit-seeking firms will spot an opportunity: buy sugar cheaply in Brazil, and sell it at a higher price in the United States. As sugar is shipped from Brazil to the United States, the quantity of sugar produced in Brazil will be greater than Brazilian consumption (with the extra production being exported), and the amount produced in the United States will be less than the amount of U.S. consumption (with the extra consumption being imported). Exports to the United States will reduce the supply of sugar in Brazil, raising its price. Imports into the United States will increase the supply of sugar, lowering its price. When the price of sugar is the same in both countries, there is no incentive to trade further. As Figure 34.2 shows, the equilibrium with trade occurs at a price of 16 cents per pound. At that price, the sugar farmers of Brazil supply a quantity of 40 tons, while the consumers of Brazil buy only 25 tons.

The extra 15 tons of sugar production, shown by the horizontal gap between the demand curve and the supply curve in Brazil, is exported to the United States. In the United States, at a price of 16 cents, the farmers produce a quantity of 72 tons and consumers demand a quantity of 87 tons. The excess demand of 15 tons by American consumers, shown by the horizontal gap between demand and domestic supply at the price of 16 cents, is supplied by imported sugar.

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Free trade typically results in income distribution effects, but the key is to recognize the overall gains from trade, as shown in Figure 34.3. Building on the concepts outlined in Demand and Supply and Demand, Supply, and Efficiency (http://cnx.org/content/m48832/latest/) in terms of consumer and producer surplus, Figure 34.3 (a) shows that producers in Brazil gain by selling more sugar at a higher price, while Figure 34.3 (b) shows consumers in the United States benefit from the lower price and greater availability of sugar. Consumers in Brazil are worse off (compare their no- trade consumer surplus with the free-trade consumer surplus) and U.S. producers of sugar are worse off. There are gains from trade—an increase in social surplus in each country. That is, both the United States and Brazil are better off than they would be without trade.

The fact that there are distributional consequences to trade is exactly the reason why workers and business lobby government for trade restrictions and protectionist regulations.

Self Check: Impact of International Trade

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