Absolute vs Comparative Advantage: What’s the Difference?

Absolute advantage means producing more of a good with the same resources. Comparative advantage means producing a good at a lower opportunity cost: giving up less of another good to make it. A country can have an absolute advantage in everything, but it cannot have a comparative advantage in everything when the opportunity costs differ.

This distinction is part of AS Level Economics, sub-topic 6.1, The reasons for international trade, at point 6.1.1. It is also assumed knowledge for A Level students.

Worked example

Assume each country has one worker, and the table shows what that worker can produce in a day if they spend the whole day making just one good.

Country A has an absolute advantage in both goods: its worker can produce more rice and more cloth than B’s worker.

Now compare what each country gives up. In A, making $1$ roll of cloth means giving up $2$ bags of rice: $12÷6=2$. In B, it means giving up $4$ bags: $8÷2=4$. So A has a comparative advantage in cloth.

For rice, A gives up $6÷12=0.5$ rolls of cloth per bag, while B gives up $2÷8=0.25$. So B has a comparative advantage in rice, despite producing less rice per worker. This is why specialisation and trade can benefit both countries: each can focus on the good it produces at the lower opportunity cost.

For example, suppose A trades $1$ roll of cloth to B for $3$ bags of rice. A receives more rice than the $2$ bags it gave up to make the cloth. B gives up fewer than the $4$ bags it would have sacrificed to make the cloth itself. Both can gain at this exchange rate.

Common exam mistake: choosing the comparative advantage by looking only at the output figures. Calculate what must be given up in each country instead.