Behavioral games
Run a Public Goods Game
Study contributions to a shared pool among two to eight human, model, or mixed participants.
The basic idea
Each player contributes from an endowment; pooled contributions are multiplied and redistributed across the group. The multiplier and group size determine whether contributing benefits the group while remaining individually costly.
Four participants each receive 100 tokens, independently contribute to a common pool, and share a doubled pool equally after all choices are locked.
How to do it
- 1
Choose two to eight seats and assign actor types and model identities.
- 2
Set endowment, public-goods multiplier, rounds, and feedback visibility.
- 3
Confirm that current-round contributions remain hidden until resolution.
- 4
Analyze contribution levels, group totals, individual payoffs, and adaptation across rounds with group clustering.
What to watch for
- Multiplier and group size jointly determine incentives.
- Players within one group are not statistically independent.
- Showing rationales or prior contributions can create communication and reputation effects.
What a useful result looks like
The ledger records each contribution, the multiplied group pool, and every participant's resolved payoff for each round.