In the United States, the only firms allowed to import cheese are certain trading companies, each of which is allocated the right to import a maximum number of pounds of cheese each year. This is an example of:
A. Import quota
B. Subsidy
C. Ad valorem tariff
D. Specific tariff

. Import quota

Explanation:

An import quota limits the amount of goods that can be imported into a country at a particular time

Subsidy is the amount granted to producers in order to keep the price of their products low.

Specific tax is tax on each unit of a good or service.

Ad valorem tariff is a type of tax where the tax paid is a percentage of the value of the good or service.

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explanation:

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