In the Prisoners' Dilemma game,the only outcome that is not Pareto optimal is also the game's only Nash equilibrium.

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In the Prisoners' Dilemma game, the only outcome that is not Pareto optimal is when both players defect, which leads to a worse outcome for both players compared to if they both cooperated. However, this outcome is also the only Nash equilibrium, where neither player has an incentive to unilaterally switch their strategy.

In the Prisoners' Dilemma Game,the Only Outcome That Is Not