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What is the prisoner's dilemma an example of?

  • A.A non zero sum game whose equilibrium is worse for both
  • B.A zero sum game with a unique minimax solution
  • C.A game of imperfect information requiring randomisation
  • D.A game in which cooperation is always the dominant strategy

Answer: A

Each prisoner does better by defecting whatever the other does, so both defect and both fare worse than if both had cooperated. It is the standard demonstration that individual rationality and collective benefit can diverge. It is not zero sum, information is complete, and defection rather than cooperation dominates. A game whose equilibrium is unanimously regretted is the sharpest possible illustration that equilibrium is not the same as optimality.

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