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Table 1 Payoffs for each player (“A, B”) in the traditional prisoner's dilemma (Axelrod 1984, p. 8)

From: Oyun: A New, Free Program for Iterated Prisoner's Dilemma Tournaments in the Classroom

  B: Cooperate B: Defect
A: Cooperate 3, 3 (mutual cooperation) 0, 5 (“sucker's payoff”)
A: Defect 5, 0 (defector's payoff) 1, 1 (mutual defection)