In each round, each group member receives the same amount of money, and each simultaneously chooses how much to contribute to a water purification project.
Use the slider to choose your amount and press Contribute.
If group’s total contributions are greater than or equal to the the Project Cost, the project is funded and every group member receives the same benefit (i.e., Your Benefit).
If the group’s total contributions are less than the Project Cost, the project is not funded.
Payoff Computation
No Rebate; No Refund
Your payoff depends both on your contribution and the contributions of the other members of your group.
If the project is funded (group’s total contributions ≥ project cost):
each player’s benefit equals Your Benefit
everyone pays his entire contribution, even if group contributions > project cost
If the project is not funded (group contributions < project cost), everyone pays his entire contribution anyway.
Example
Project cost (the threshold) is $50; Private Benefit is $15; Endowment is $20
You contributed $12; total group contributions were $60
Total Payoff
=
Endowment
–
Contribution
+
Private Benefit
$23
=
$20
–
$12
+
$15
You contributed $12; total group contributions were $45