If one country has the ability to produce all goods and services more efficiently than any other country, then:

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Quizplus · Accepted Answer

Even if a country can produce all goods and services more efficiently than any other country, there is still benefit to trading because comparative advantages exist. Comparative advantage is the ability of a country to produce a certain good or service at a lower opportunity cost than another country. This means that even if a country can produce everything more efficiently, there are still certain goods and services that it can produce at a lower opportunity cost and can trade with other countries to benefit both parties.

If One Country Has the Ability to Produce All Goods