Comparative Advantage
In economics, comparative advantage refers to the ability of a party to produce a particular good or service at a lower marginal and opportunity cost over another. Even if one country is more efficient in the production of all goods (has an absolute advantage in all goods) than another, both countries will still gain by trading with each other. More specifically, countries should import goods if the opportunity cost of importing is lower than the cost of producing them locally.
Specialization according to comparative advantage results in a more efficient allocation of world resources. Larger outputs of both products become available to both nations. The outcome of international specialization and trade is equivalent to a nation having more and/or better resources or discovering improved production techniques.
Determining Comparative Advantage
Imagine that there are two nations, Chiplandia and Entertainia, that currently produce their own computer chips and CD players . Chiplandia uses less time to produce both products, while Entertainia uses more time to produce both products. Chiplandia enjoys and absolute advantage, an ability to produce an item with fewer resources. However, the accompanying table shows that Chiplandia has a comparative advantage in computer chip production, while Entertainia has a comparative advantage in the production of CD players. The nations can benefit from specialization and trade, which would make the allocation of resources more efficient across both countries.
Comparative Advantage
Chiplandia has a comparative advantage in producing computer chips, while Entertainia has a comparative advantage in producing CD players. Both nations can benefit from trade.
For another example, if the opportunity cost of producing one more unit of coffee in Brazil is 2/3 units of wheat, while the opportunity cost of producing one more unit of coffee in the United States is 1/3 wheat, then the U.S. should produce coffee, while Brazil should produce wheat (assuming Brazil has the lower opportunity cost of producing wheat).
Comparative vs Competitive Advantage
It is important to distinguish between comparative advantage and competitive advantage. Though they sound similar, they are different concepts. Unlike comparative advantage, competitive advantage refers to a distinguishing attribute of a company or a product. It may or may not have anything to do with opportunity cost or efficiency. For example, having good brand recognition or relationships with suppliers is a competitive advantage, but not a comparative advantage. In the context of international trade, we more often discuss comparative advantage.