It is called the public goods game. To see how it works, pretend that you are a participant along with nine strangers whom you will never meet. Each of you has been given five one-dollar bills and told that you can keep all of them and take them home. However, you can also decide whether you would like to contribute anonymously any of the dollars to a “public good pot.” Each dollar you or anyone else contributes will be doubled by the experimenters, and then the pot will be divided equally among the ten players. If no one contributes anything, each player takes home five dollars. If everyone
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