The Prisoner's Dilemma constitutes a problem in game theory.

In its classical form, the prisoner's dilemma (PD) is presented as follows:

Two suspects are arrested by the police. The police have insufficient evidence for a conviction, and, having separated both prisoners, visit each of them to offer the same deal.
  • If one testifies (defects) for the prosecution against the other and the other remains silent, the betrayer goes free and the silent accomplice receives the full 10-year sentence.
  • If both remain silent, both prisoners are sentenced to only six months in jail for a minor charge.
  • If each betrays the other, each receives a five-year sentence.
Each prisoner must choose to betray the other or to remain silent. Each one is assured that the other would not know about the betrayal before the end of the investigation.

How should the prisoners act?

Even when the limitation that the prisoners are separated is removed the dilemma still remains.

To see a lecture on this:

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