题目内容
The Ricardian theory of comparative advantage assumes only two nations and two products, labor can move freely within a nation, and perfect competition exists in all markets.
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Assume that the United States is more efficient than the United Kingdom in the production of all goods. Mutually beneficial trade is possible according to the principle of absolute advantage, but is impossible according to the principle of comparative advantage.
It is possible for a nation not to have an absolute advantage in anything; but it is not possible for one nation to have a comparative advantage in everything and the other nation in nothing.
Ricardo's theory of comparative advantage was of limited relevance to the real world since it assumed that labor was only one of several factors of production.
Compared to Ricardian trade theory, modern trade theory provides a more general view of comparative advantage since it is based on all factors of production rather than just labor.
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