The increasing opportunity costs as country move along a production possibilities frontier (PPF) are a result of the resources.
In macroeconomics, the production possibilities frontier is the set of points at which a country’s economy is most efficiently allocating its resources to produce as many goods as possible. If production is on the production possibilities frontier, the country can only produce more of one good if it produces less of some other good.
If the economy is producing less than the quantities indicated by the production possibilities frontier, this is a sign that resources are not being used to their full potential. In this case, it is possible to increase the production of some goods without cutting production in other areas.
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