In this study, you will be in a randomly formed group of 3 participants. Each participant in the group is given 100 points. The group has the opportunity to undertake a joint project. Each participant in the group decides how much she or he is going to contribute to the project. Contribution could be any integer from 0 to 100 points.

The earnings from the project are calculated as follows: The contributions of all 3 participants are added up, the total contribution is multiplied by a factor of 2, and the resulting amount is the total earnings from the project, which is evenly split among all 3 participants. Your payoff equals your earnings from the project, plus the amount you did not contribute.