If country A has a comparative advantage over country B in the production of good X, then country A cannot gain from trade with country B.

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If country A has a comparative advantage over country B in the production of good X, then it means that country A can produce good X at a lower opportunity cost than country B. In this case, both countries can benefit from trade by specializing in the production of goods in which they have a comparative advantage and exchanging them. Country A can specialize in the production of good X and export it to country B, while country B can specialize in the production of another good and export it to country A. This way, both countries can gain from the trade. Even if country A has a comparative advantage over country B in the production of good X, both countries can still gain from trade. Country A can specialize in producing good X and export it to country B, while country B can specialize in producing another good Y in which it has a comparative advantage and export it to country A. Both countries can then import the good they do not specialize in producing, leading to mutual gains from trade.

If Country a Has a Comparative Advantage Over Country B