Why would a country such as the United States, which can presumably produce everything it needs itself, choose to trade with other nations?© BrainMass Inc. brainmass.com March 22, 2019, 2:17 am ad1c9bdddf
In general, countries trade with each other because of an economic concept known as comparative advantage. According to the law of comparative advantage, a country should focus on (specialize) in producing and exporting resources which it can produce at the least opportunity cost and import the resources for which it is a high cost-producer.
To further understand this concept, let me explain what opportunity cost means. Opportunity cost can be remembered as what you give up/ what you gain. It is simply the cost of something forgone ...
Gains in trade through comparative advantage. Why nations trade with each other.