题目内容
As long as it is assumed that a nation accounts for a negligible portion of international trade, its levying an import tariff necessarily increases its overall welfare.
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Changes in a "large'' country's economic conditions or trade polices can affect the terms at which it trades with other countries.
A "large" country, that levies a tariff on imports, cannot improve the terms at which it trades with other countries.
For a "large'' country, a tariff on an imported product may be partially absorbed by the domestic consumer via a higher purchase price and partially absorbed by the foreign producer via a lower export price.
If a "large" country levies a tariff on an imported good, its overall welfare increases if the monetary value of the tariff's consumption effect plus protective effect exceeds the monetary value of the terms-of-trade effect.
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