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Welcome to our experiment. Please read the following instructions carefully.

You are part of a group of four players.

One of you has been robbed, but at the moment it is not clear who. Now, everybody can decide whether to call the police or not.

Calling the police comes with a cost of 5 points, but as a reward you receive 10 points. The final payment would be 10 - 5 = 5 points, when you decide to call the police. The other players benefit from the police being called and receive 10 points . If no one calls the police, everyone except for the victim receives a payoff of 0 points.

One of the four players has been the victim who suffers from being robbed. If nobody calls the police, the victims payoff will be -5 points. If someone calls, the payoff of the victim amounts to 0 points.

The probability of being robbed and becoming the victim is 1/4.
The identity of the victim will only be revealed at the end.

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