This document discusses various trade barriers such as tariffs and non-tariff barriers. It defines tariffs as taxes on imported goods which make imported goods more expensive. It describes different types of tariffs such as specific tariffs which charge a fixed fee per unit and ad valorem tariffs which charge a percentage of the good's value. It also discusses non-tariff barriers such as import quotas, licenses, and local content requirements. It explains that trade barriers benefit domestic industries by reducing competition but harm consumers by increasing prices. The government also benefits from increased tariff revenue in the short run.