The slope of the PPF is different at each point; indicating that the opportunity cost of grade points in terms of fun is different at each point. In fact, the slope of the PPF is the opportunity cost.

   At a point like A, giving up a small amount of fun leads to a large increase in GPA, so the curve is very steep. At a point like C, a small increase in GPA requires that a lot of fun be given up.

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