In any subgame perfect equilibrium to an infinitely repeated Prisoners' Dilemma game, the players will end up cooperating.

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In an infinitely repeated Prisoners' Dilemma game, subgame perfect equilibrium can support both cooperation and defection, depending on the discount factor that reflects how players value future payoffs. If the discount factor is high enough, cooperation can be sustained as a subgame perfect equilibrium, but if it is low, defection may be the outcome in the equilibrium.

In Any Subgame Perfect Equilibrium to an Infinitely Repeated Prisoners