MobLab
Instructions
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# Linear Public Good

## How to Play

• In each round, each group member receives the same amount of money, and each simultaneously chooses how much of it to contribute to a water purification project.
• Use the slider to choose your amount and press Submit.

## Payoff Computation

• Your payoff depends both on your contribution and the contributions of the other members of your group.
• Each round, your payoff equals the amount you did not contribute plus:
• Each citizen benefits from the total amount contributed by the all members of the group
• each player's benefit equals the total group contributions times the Rate of Return

## Example

• You contributed \$12; total group contributions were \$20
• Total
Payoff
= Endowment Your
Contribution
+ Rate of
Return
× Total
Contributions
\$18 = \$20 \$12 + 50% × \$20
• You contributed \$12; total group contributions were \$30
• Total
Payoff
= Endowment Your
Contribution
+ Rate of
Return
× Total
Contributions
\$23 = \$20 \$12 + 50% × \$30 