A tax on imported goods and services. Tariffs are used to restrict trade, as they increase the price of imported goods and services, making them more expensive to consumers.

There are generally two types of tariffs. Ad valorem tariffs are calculated as a fixed percentage of the value of the imported good. When the international price of a good rises or falls, so does the tariff. A specific tariff is a fixed amount of money that does not vary with the price of the good. In some cases, both the ad valorem and specific tariffs are levied on the same product.