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In this game, you will be matched into a group of 4 people and you will play 10 rounds in this group.
In each round, each person is given an endowment of 20 tokens and can choose how many of these tokens to keep for themselves and how many to contribute to a group account. At the end of the round, the tokens in the group account are doubled and then divided equally among the four group members. That is, each person receives a return of 0.5 for each token that is contributed by someone to the group account.
Your payoff after each group member makes their contribution decision is:
Payoff = 20 - Own Contribution + 0.5 (Total Amount Contributed by All Group Members)