It's not likely that a country will specialize completely in one good even if it has a lower opportunity cost because

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Quizplus · Accepted Answer

Opportunity costs increase as more of a good is produced, so it becomes less efficient to specialize completely in one good. Additionally, countries would want to save some of the good for their own citizens, which is why complete specialization is unlikely. Comparative advantage is still a valid concept in the world economy, but it doesn't necessarily lead to complete specialization.

It's Not Likely That a Country Will Specialize Completely in One