Link: http://www.npr.org/blogs/money/2011/02/15/131963928/the-friday-podcast-a-giant-stone-coin-at-the-bottom-of-the-sea
Summary: What is money? Consideration of the question led Planet Money to Yap — a tiny island in the middle of the Pacific Ocean, where giant stone discs used to be used as a form of money.
Original air date: December 10, 2010
Length: 21:13
Main story content begins: 2:19
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