Comparative advantage

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Comparative advantage is a term economists use, especially in international trade. A country has a comparative advantage when it can make goods or services at a lower opportunity cost than another country.[1]

Ricardo's example

For example, during the Industrial Revolution, England and Portugal both made wine and cloth.

More information Country \ Produce, Cloth ...

Suppose the number shows the number of hours required to create one piece of cloth or one crate of wine. In 100 hours, England can either make 1 unit of cloth or 5/6 units of wine. Meanwhile in 90 hours Portugal can make 1 unit of cloth or 9/8 units of wine. Portugal has an absolute advantage in both. However England's opportunity cost of 5/6 is lower than Portugal's OC 9/8. Hence England has a comparative advantage in cloth-making.

David Ricardo predicted that Portugal would stop making cloths and England would stop making wine. That did happen.[2]

Theory predicts that even if one country can produce all good more efficiently than another, trade will make both better off if they specialize in the goods they have a comparative advantage in.

This theory also says that protectionism (raising tariffs or blocking trade from other countries) does not work in the long run.[2]

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