Production Possibilities Frontier - Hanging Out/Going Out    Thus far, all the PPFs we've examined were curved out (curved in makes no sense, see if you can figure out why). However, PPFs can be straight lines when the opportunity cost of one good in terms of the other doesn't change.

   On the graph to the right we measure time spent Hanging Out with friends and Going Out to clubs. Since both are measured in time spent, the opportunity cost of one in terms of the other must be constant, 1 hour. If these are your only two leisure activities, then an added hour going out will always cost you one hour of hanging out.

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