There are a number of reasons nations and entities seek to benefit from international economic activities. Among the most important are the following:
Create Demand: To develop new markets for the sale of goods and services abroad. Exports increase domestic demand, which raises output, revenues, and employment, thus benefiting both entities engaged in export activities and national economic measures.
Create Supply: To obtain commodities not otherwise available domestically (e.g., in the United States), or available only in limited supply. Certain raw materials, like tin, tungsten, and tea, are available only from foreign (i.e., non-U.S.) sources. Other important goods, like oil, are available domestically only in limited supply which must be supplemented with substantial imports. To obtain these economic resources in the quantity needed, entities must import commodities from other countries (economies).
Create Cost Efficiency: To obtain goods and services at lower costs than available domestically. Although certain goods and services may be available domestically, they cost more than if acquired in a foreign country. Thus, in a completely open worldwide economic system, entities will acquire economic resources from the lowest cost provider, wherever located.