The public goods game works like this: A group of people sits around a table, and each person is given a few dollars. The group is told they can put as much money as they want in the community pot. An experimenter then doubles the pot, and everyone then gets an equal portion back. If it’s ten people and everyone gets $2, and everyone puts in that money, the pot would be $20. It gets doubled to $40 and divided by ten. Everyone gets back $4. The game proceeds in rounds, and you would think everyone would just put the maximum amount in the pot each time—but they don’t. Someone usually gets the
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