Tariff
In contrast, in economic theory tariffs are viewed as a primary element in international trade with the function of the tariff being to influence the flow of trade by lowering or raising the price of targeted goods to create what amounts to an artificial competitive advantage. When tariffs are viewed and used in this fashion, they are addressing the country's and the competitors' respective economic healths in terms of maximizing or minimizing revenue flow rather than in terms of the ability to generate and maintain a competitive advantage which is the source of the revenue. As a result, the impact of the tariffs on the economic health of the country are at best minimal but often are counter-productive.
Tariff in United States history
Currently only about 30% of all import goods are subject to tariffs in the United States, the rest are on the free list. The "average" tariffs now charged by the United States are at a historic low. The list of negotiated tariffs are listed on the Harmonized Tariff Schedule as put out by the United States International Trade Commission.