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What is comparative advantage?

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Quick answer

Comparative advantage is the economic idea that people or countries gain by specializing in what they give up the least to produce, then trading. Even if one party is better at everything, both still benefit by focusing where their relative cost is lowest.

Key things to understand

  1. It's about lowest opportunity cost, not being the absolute best.
  2. Specializing and then trading lets total output rise for everyone.
  3. It explains why countries trade even with a more productive partner.
  4. It was introduced by economist David Ricardo in 1817.
  5. It is a core argument for the benefits of free trade.

People also ask

How is comparative advantage different from absolute advantage?
Absolute advantage is producing something using fewer resources; comparative advantage is producing it at a lower opportunity cost — what you sacrifice to make it.
Why trade if you're better at everything?
Because your time is limited — focusing on what you're relatively best at and trading for the rest produces more overall than doing it all yourself.
Who came up with comparative advantage?
British economist David Ricardo formalized it in 1817 to explain the gains from international trade.