Moving along a country's PPF,a reason opportunity costs increase is that

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As a country produces more and more of one good, the opportunity cost of producing that good increases because resources are not equally efficient at producing both goods. Some resources are better suited for producing one good rather than the other, which means that as production of one good increases, more and more resources have to be diverted from the other good, leading to a higher opportunity cost.

Moving Along a Country's PPF,a Reason Opportunity Costs Increase Is