Why would a country want to erect trade barriers such as tariffs or quotas?

Although most countries still erect trade barriers, they also want to engage in international trade. Because of that they enter into trade agreements with other countries. The reason for trade barriers is to protect domestic jobs and in other words to protect local industries. When there is no barrier and quota all the products and services could be easily funneled into country.

answer; fair labor and standard act;

answer; adjusting and adapting to a culture other than one's own;