Absolute and Comparative Advantage — A-Level Economics
A-Level Economics · CIE 9708 · 15 min read
1. Absolute Advantage: Definition and Application★★☆☆☆⏱ 5 min
Adam Smith first proposed absolute advantage as the basis for free trade, arguing that countries should specialize in goods they produce more efficiently than trading partners. This explains many patterns of trade, but it cannot explain mutually beneficial trade when one country is more efficient at producing all goods.
2. Comparative Advantage and Opportunity Cost★★★☆☆⏱ 8 min
3. Gains from Specialization and Trade★★★☆☆⏱ 7 min
When countries specialize in producing the good in which they have comparative advantage, total world output increases. Both countries can then trade to consume more of both goods than they could produce on their own, meaning both gain from voluntary trade.
Common Pitfalls
Why: This mixes up the two core concepts: comparative advantage depends on opportunity cost, not absolute output.
Why: This reverses the opportunity cost and leads to wrong identification of comparative advantage, losing easy marks.
Why: Reciprocal comparative advantage (one country has comparative advantage in good 1, the other in good 2) is only guaranteed for two-good two-country models.
Why: A key implication of comparative advantage that examiners test is that voluntary trade between countries is mutually beneficial.