The ability of a country to produce a good at a lower cost than another country can.

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This is about comparative advantage—the ability of a country to produce a good at a lower opportunity cost relative to other countries. It explains why nations benefit from trade even if one country is more productive in producing every good. When a country has the smallest opportunity cost in making a good, it should specialize in that good and trade for others, leading to more efficient global production and gains for both sides. For example, if Country A gives up fewer units of one good to produce another than Country B does, A has a comparative advantage in that good. The other options describe policy tools or concepts that affect costs or trade (tariffs, embargoes, subsidies) but do not capture the cross-country cost comparison at the heart of why trade happens.