If the opportunity cost of grade points in terms of fun is greater the higher your grades, then the set of GPA/Fun combinations available to our student might look like the curve to the left.
A curve like this is commonly called a Production Possibilities
Frontier or PPF. It can also be called a Production Possibilities Curve or (if
we include the points under the curve) a Production Possibilities
Set (more on the points under the curve later).
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