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 tax|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 tax|ad valorem]]'' tariff. |