Why Keeping One Token Can Pay
In a shared-payout game, contributing has two effects: it increases the pool everyone can benefit from, but it also costs the contributor something personally. If a player can take a share of the pool without contributing, that player gets the benefit while avoiding the cost. This is the basic incentive conflict: what looks advantageous for one person can leave the group with less than it could have earned through cooperation.
The Damage Spreads Through Expectations
The first defection changes more than the size of the pool. It gives other players evidence about what they can expect from the group. Someone who contributed may now wonder why they should keep paying a personal cost if another player can free-ride—and if others respond the same way, contributing becomes less attractive still.
This is why cooperation can unravel without anyone coordinating to end it. Each person’s decision is a response to what they believe others will do. A player’s short-term gain can therefore trigger a chain of reduced contributions, shrinking the shared payout for everyone, including the original defector.
Making Cooperation More Durable
Groups can resist that slide when contributions are visible, players meet repeatedly, or free-riding carries a consequence. Those conditions make it easier to distinguish a one-time lapse from a pattern and give contributors reason to believe their effort will not simply subsidize someone else. The key is not that every player must be perfectly generous; it is that the rules make cooperation feel like a worthwhile risk. Without that assurance, one person’s saved token can cost the group far more than its face value.
