CooperateDefectCooperate-1, -1-10, 0Defect0, -10-5, -5
http://www.beyondintractability.org/...rs-dilemma.gif
The Prisoner's Dilemma
On the other hand, some scholars see game theory not as a predictive tool for the behavior of human beings, but as a suggestion for how people ought to behave. Since a
Nash equilibrium of a game constitutes one's
best response to the actions of the other players, playing a strategy that is part of a Nash equilibrium seems appropriate. However, this use for game theory has also come under criticism. First, in some cases it is appropriate to play a non-equilibrium strategy if one expects others to play non-equilibrium strategies as well. For an example, see
Guess 2/3 of the average.