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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Behav Processes. 2010 Dec 22;87(1):25–33. doi: 10.1016/j.beproc.2010.12.004

Figure 1.

Figure 1

Diagram of multi-person prisoner's dilemma game (lecture game). Lines A-D and B-C show returns to players who choose Y (cooperate) or choose X (defect) as a function of the decreasing number of players (out of 10) who choose Y (note reversed x-axis). The dashed line shows average earnings across the 10 players.