Historically, the most important trade barriers have been tariffs and a. minimum wage laws. c. taxes on exports. b. quotas. d. subsidies

The correct answer is b. quotas. This is the a limit of quantity of a product coming into a country that a goverment imposes in order to protect domestic producers. However, quota causes an important profit lost because the goverment does not earn a tax revenue, so it is less frequently used than the tariffs.

Historically, the most important trade barriers have been tariffs and .

Quotas

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