What does the concavity (bowed-out shape) of the production possibilities curve result from?

Question

Quizplus · Accepted Answer

The concavity of the production possibilities curve results from the law of increasing opportunity cost. As we produce more of a good, the opportunity cost of producing it increases because we have to give up more and more of another good to produce an additional unit of the first good. This leads to a bowed-out shape of the production possibilities curve.

What Does the Concavity (Bowed-Out Shape) of the Production Possibilities