One of the most renowned parables in economics is that of the Capitol Hill babysitting co-operative.
It became famous because of Paul Krugman, a winner of the Nobel memorial prize in economics and a pugnacious columnist for The New York Times.
Long, long ago (the 1970s) in a town far, far away (Washington, DC) there was a babysitting co-op with a problem. The 150 or so families in the co-op, mostly congressional staffers, shared babysitting duties and kept track of who was owed babysitting, and who was owing, with a system of “scrip” - tokens good for a half-hour's sitting.
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