[Niamh.]

3. The Prisoner’s Dilemma

You are a member of a gang and you have been arrested with another member of your gang. Both of you are confined away from each other and you have no way of communicating with the other member. The police does not have enough evidence to convict both of you with major charges and instead offer you and the other member a bargain. You have two choices:
(a) You can remain silent
(b) Or betray the other member and testify that he has committed the crime.

Then there are three outcomes:
(a) If you betray the other member and he remains silent, you will be set free and he will serve 3 years in prison. (But this also works vice versa. If you remain silent and he betrays you, you will serve 3 years in prison)
(b) If you betray the other member, and he betrays you too, you both serve 2 years in prison
(c) If you and the other member both remain silent, you both only serve one year in prison.

What would you do?

http://www.friesian.com/valley/dilemmas.htm