While not as relevant today, the trade theory that was useful in explaining the pattern of trade when the US dominated the global market is the theory.

product life-cycle theory

Explanation:

Based on the information provided within the question it can be said that theory that was used to explain this was the product life-cycle theory. This is a theory that explains how all the parts and labor that are associated with a product are performed/created where the product was invented until the point where the product becomes adopted worldwide, then production spreads around the world.

answer; institution;

answermeasured by how well she or he does the job'; /