It is true that two countries can benefit from trade even if one of them has a clear advantage in producing all goods. Each nation only needs to have a comparative advantage in one particular good.
When producing a specific good, agents in an economic model have a comparative advantage over rivals if they can do so at a lower relative opportunity cost or autarky price, that is, at a lower relative marginal cost before trade.
Your greatest skill and least amount of sacrifice are your comparative advantages. If you are a great babysitter and a great plumber, for instance, your comparative advantage is plumbing.
Developed by British economist David Ricardo in the 19th century, comparative advantage is an economic theory that links differences in relative opportunity costs, or the price paid for producing a given good, across nations, to the causes and benefits of international trade.
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