Prisoner's dilemma
Instructions
You and a randomly chosen
coplayer are matched for one round of the prisoner?s dilemma game. Each
can opt either for cooperation or defection. If both choose to cooperate,
both get 3 points each. If you both choose to defect, you get 1 point each.
If you choose defect and the other cooperate, you receive 5 points and
your coplayer nothing. Conversely, if you cooperate and the other defects,
you receive nothing and the coplayer gets 5 points.
Evaluations
Number of players: 28 (14 games)
Frequency of payoffs:
Notes

R: Reward S: Sucker's payoff T: Temptation P: Punishment

The players have only weak püreferences for cooperation (53.6%)
Comments
The rational move is to defect (you get more, no matter what the other
player decides to do). A majority chooses to cooperate, however.
Written by Christoph Hauert