This isn't entirely related to one of the pure sciences and I don't need the math but anyway here's the question. "Cooperative equilibrium is most likely to form in prisoner's dilemma-type games of: A. No communication and single round B. Single round and a large number of players C. Repeated rounds and a small number of players D. Repeated rounds and a large number of players" My economics book doesn't mention anything about whether a large of small amount of people affects whether a cooperative equilibrium is likely to arise. I thought it over for about an hour now and I can't seem to prove that more people = more cooperation or that factions would start to form and destroy the cooperative equilibrium. Having played this game before several times I've noticed that when I am in a larger group that the group tends to want to backstab the other team more.