Comparative advantage
In economics, the theory of comparative advantage explains why it can be beneficial for two countries to trade, even though one of them may be able to produce every kind of item more cheaply than the other. What matters is not the absolute cost of production, but rather the ratio between how easily the two countries can produce different kinds of things. It was first described by Robert Torrens in 1815 in an essay on the corn trade. He concluded that it was to England's advantage to trade various goods with Poland in return for corn, even though it might be possible to produce that corn more cheaply in England than Poland.However it is usually attributed to David Ricardo who explained it clearly in his 1817 book The Principles of Political Economy and Taxation in an example involving England and Portugal. In Portugal it is possible to both produce wine and cloth with less work than it takes in England. However the relative costs of producing those two goods are different in the two countries. In England it is very hard to produce wine, and only moderately difficult to produce cloth. In Portugal both are easy to produce. Therefore while it is cheaper to produce cloth in Portugal than England, it is cheaper still for Portugal to produce excess wine, and trade that for English cloth. And conversely England benefits from this trade because its cost for producing cloth has not changed but it can now get wine at closer to the cost of cloth.
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