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The government imposes tariffs to protect the domestic producer; thus, reducing the number of imports. The other nations also impose tariffs to protect their producers as a response, reducing the export of the nation that levied tariffs. Thus, protective tariffs reduce both the imports and the exports of the nation.

The import competition improves the quality of the U.S. goods to gain shares in the global market. The U.S. firms have to make their imports different from other nations' firms. As the quality of the product increases, it will also increase the export; thus, as export increases, then production also rises. The increase in the production level also decreases the cost of production as the firm competes with the cost side.