In the real world we don't observe countries completely specialising in the production of goods for which they have a comparative advantage.One reasons for this is that

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Production of most goods involves increasing opportunity costs, which means that as a country produces more of a specific good, the opportunity cost or the cost of producing each additional unit increases. Therefore, a country may not completely specialize in the production of a good for which they have a comparative advantage, as producing only that good may become inefficient and costly due to increasing opportunity costs.

In the Real World We Don't Observe Countries Completely Specialising