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Welcome to the public goods game. In this game, you and three other players will make decisions that will affect your earnings. Each of you will be given an equal number of tokens at the start of each round. You can choose to contribute any number of your tokens to a public pool. You may also choose to contribute nothing and keep all your tokens.
After all players have made their contributions, the total amount in the public pool will be doubled. This multiplied amount will then be divided equally among all four players, regardless of how much each one contributed.
The game will consist of multiple rounds. You will not know the identity of the other players, and they will not know yours. Contributions are made in secret, and the amount contributed by each player will not be revealed.
Your earnings in each round will consist of the tokens you kept plus your share of the multiplied amount from the public pool. Your total earnings will be the sum of your earnings from all rounds.
Synchrony group: Here, all players must respond at the same time. You will see a red timer that counts down from a given number to zero. As soon as this timer hits 0, everyone must make their contribution immediately. There will be four boxes, each representing one player. When a player submits their contribution, their respective box will turn green.
Control group: Here, all players can respond at any point within a round. You will see a red timer that counts down from a given number to zero. You must make your contribution any time before the timer hits 0. There will be four boxes, each representing one player. When a player submits their contribution, their respective box will turn green.
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