What institutions can sustain cooperation in groups of strangers? Here we study the role of monetary systems. In an experiment, subjects sometimes needed help and sometimes could incur a cost to help an anonymous counterpart. In the absence of money, the intertemporal exchange of help, which could be supported by a norm of community punishment of defectors, did not emerge. Introducing
intrinsically worthless tokens substantially altered patterns of behavior. Monetary trade emerged, which increased predictability of play and promoted cooperation when strangers could trade help for a token.
"The Coordination Value of Monetary Exchange: Experimental Evidence." American Economic Journal: Microeconomics,
Stochastic and Dynamic Games; Evolutionary Games; Repeated Games
Market Structure and Pricing: General
Monetary Systems; Standards; Regimes; Government and the Monetary System; Payment Systems