What condition(s) must exist to make trade among nations mutually beneficial?

Question

Quizplus · Accepted Answer

Trade among nations is mutually beneficial when each nation has a comparative advantage in the production of a good. This means that each nation specializes in producing and exporting goods for which it has a lower opportunity cost than other nations, leading to more efficient global production and increased welfare for all countries involved. Absolute advantage, identical opportunity costs, absence of tariffs or quotas, and equal efficiency are not necessary conditions for mutually beneficial trade.

What Condition(s) Must Exist to Make Trade Among Nations Mutually