What is the term for a tax on imports that is equal to a percentage of the cost of those imports?

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An ad valorem tariff is a tax on imports that is equal to a percentage of the cost of those imports. A specific tariff is a tax on imports that is a fixed amount per unit, regardless of the price of the imported good. A tax on luxury goods only would not apply to all imported goods. An effective tariff takes into account both specific and ad valorem tariffs, as well as any other costs involved in importing goods.

What Is the Term for a Tax on Imports That