Absolute and Comparative Advantage
In trade, absolute advantage is when a country can produce a greater quantity of a good or service with the same input (typically labor) at a lower cost. The theory of absolute advantage was developed by the Scottish economist Adam Smith in his book The Wealth of Nations.
Comparative advantage is a theory developed by the English political economist David Ricardo in his book On the Principles of Political Economy and Taxation. Comparative advantage, also called Ricardian advantage, describes one country's ability to produce a good or service at a lower opportunity cost than another country. Opportunity cost is the idea that making and selling one product or service is a trade-off, since you forfeit the opportunity to produce another product instead.
Read this section and answer the questions at the end.
What are the opportunity costs and gains from trade?
The range of trades that will benefit each country is based on the country's opportunity cost of producing each good. The United States can produce 100 bushels of corn or 50 barrels of oil. For the United States, the opportunity cost of producing one barrel of oil is two bushels of corn. If we divide the numbers above by 50, we get the same ratio: one barrel of oil is equivalent to two bushels of corn, or (100/50 = 2 and 50/50 = 1). In a trade with Saudi Arabia, if the United States is going to give up 100 bushels of corn in exports, it must import at least 50 barrels of oil to be just as well off. Clearly, to gain from trade it needs to be able to gain more than a half barrel of oil for its bushel of corn - or why trade at all?
Recall that David Ricardo argued that if each country specializes in its comparative advantage, it will benefit from trade, and total global output will increase. How can we show gains from trade as a result of comparative advantage and specialization? Table 6 shows the output assuming that each country specializes in its comparative advantage and produces no other good. This is 100% specialization. Specialization leads to an increase in total world production. (Compare the total world production in Table 3 to that in Table 6).
| Country | Quantity produced after 100% specialization - Oil (barrels) | Quantity produced after 100% specialization - Corn (bushels) |
|---|---|---|
| Saudi Arabia | 100 | 0 |
| United States | 0 | 100 |
| Total World Production | 100 | 100 |
| Table 6. How Specialization Expands Output | ||
What if we did not have complete specialization, as in Table 6? Would there still be gains from trade? Consider another example, such as when the United States and Saudi Arabia start at C and C', respectively, as shown in Figure 1. Consider what occurs when trade is allowed and the United States exports 20 bushels of corn to Saudi Arabia in exchange for 20 barrels of oil.
Starting at point C, reduce Saudi Oil production by 20 and exchange it for 20 units of corn to reach point D (see Figure 2). Notice that even without 100% specialization, if the "trading price," in this case 20 barrels of oil for 20 bushels of corn, is greater than the country's opportunity cost, the Saudis will gain from trade. Indeed both countries consume more of both goods after specialized production and trade occurs.