Link: http://www.npr.org/sections/money/2016/01/06/462149561/episode-15-delicious-cake-futures
Summary: An elementary lunch room has more economics involved then one would think. Snacks are the currency, and the trading is of the food. In this story, Planet Money discusses how one kid developed a derivative for a cake, by trading for snacks now for a piece of the cake later.
Original Air Date: March 9, 2009
Length: 15 minutes 16 seconds
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