The principal concept behind comparative advantage is that a nation should:

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The principle behind comparative advantage is that a nation should concentrate its production on those goods for which it has the lowest domestic opportunity cost, and import goods for which it has a higher opportunity cost. This enables the nation to produce more efficiently and at a lower cost, and to benefit from international trade. Maximizing trade, using tariffs and quotas, or striving for self-sufficiency are not necessarily aligned with the principle of comparative advantage.

The Principal Concept Behind Comparative Advantage Is That a Nation