Changes

A tariff is a tax or custom duty on an imported [[good]].  It can take one of two forms:  (1) a tax per unit, known as a specific tariff, or (2) a tax based on the value of the good, known as an ad valorem tariff.

A tariff is a tax or custom duty on an imported [[good]].  It can take one of two forms:  (1) a tax per unit, known as a specific tariff, or (2) a tax based on the value of the good, known as an ad valorem tariff.