Production Possibilities Frontier - Grades/Fun    The purple shaded area, on the graph to the right, is made up of points offering both more fun and a higher GPA than G. Since these are both good things, we know that these points would be preferred to G, no matter what our student's tastes.

   Both the opportunity cost of fun in terms of GPA, and the opportunity cost of GPA in terms of fun, are zero at G. Therefore, at point G, our student can have more of both and would prefer to do so. Hence, this shaded region contains points that are preferred to G, by just about anyone.

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