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International Trade - Theory and Policy, 2010a

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The quantity of imports <strong>and</strong> exports is shown as the blue line segment on each country’s graph. (That’s<br />

the horizontal distance between the supply <strong>and</strong> dem<strong>and</strong> curves at the free trade price.) When a large<br />

importing country implements a tariff it will cause an increase in the price of the good on the domestic<br />

market <strong>and</strong> a decrease in the price in the rest of the world (RoW). Suppose after the tariff the price in the<br />

importing country rises to PIMT <strong>and</strong> the price in the exporting country falls to PEXT. If the tariff is a<br />

specific tax, then the tariff rate would be T=PIMT−PEXT, equal to the length of the green line segment in<br />

the diagram. If the tariff were an ad valorem tax, then the tariff rate would be given by T=PIMTPEXT−1.<br />

Table 7.1 "Welfare Effects of an Import Tariff" provides a summary of the direction <strong>and</strong> magnitude of the<br />

welfare effects to producers, consumers, <strong>and</strong> the governments in the importing <strong>and</strong> exporting countries.<br />

The aggregate national welfare effects <strong>and</strong> the world welfare effects are also shown.<br />

Table 7.1 Welfare Effects of an Import Tariff<br />

Importing Country Exporting Country<br />

Consumer Surplus − (A + B + C + D) + e<br />

Producer Surplus + A − (e + f + g + h)<br />

Govt. Revenue + (C + G) 0<br />

National Welfare + G − (B + D) − (f + g + h)<br />

World Welfare −; (B + D) − (f + h)<br />

Refer to Table 7.1 "Welfare Effects of an Import Tariff" <strong>and</strong> Figure 7.13 "Welfare Effects of a Tariff: Large<br />

Country Case" to see how the magnitudes of the changes are represented.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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