1.4 Comparative Advantage and Trade

Absolute vs. Comparative Advantage

Absolute advantage means a producer can make more output using the same resources than another producer. Comparative advantage means a producer has a lower opportunity cost of producing a good. Trade should be based on comparative advantage, not absolute advantage — even a producer without any absolute advantage can still have a comparative advantage in something.

Calculating Opportunity Cost

Use a production possibilities table or graph to find opportunity cost: divide what you give up by what you gain. For a country producing goods X and Y, the opportunity cost of X = (amount of Y given up) / (amount of X gained). The producer with the lowest opportunity cost for a good should specialize in producing it.

Gains from Trade & Terms of Trade

When each country specializes according to comparative advantage and trades, total output rises and both can consume beyond their own PPC. The terms of trade (exchange rate between goods) must lie between each country's opportunity costs for both to benefit. This mutually beneficial trade increases total consumption and efficiency for both parties.

Key terms

Absolute advantage

The ability to produce more of a good using the same resources than another producer.

Comparative advantage

The ability to produce a good at a lower opportunity cost than another producer.

Opportunity cost (in trade)

The amount of one good given up to produce another; calculated as give up ÷ gain from a PPC.

Terms of trade

The agreed exchange rate between two goods that must lie between both countries' opportunity costs for mutual benefit.

Gains from trade

Increased total output and consumption possible when countries specialize by comparative advantage and trade.

Try an AP-style question

Who has the comparative advantage in hats?

1. Both equally
2. Neither
3. Ben
4. Ana