Comment by fennecbutt

If it wasn't numbers showing finance it was previously unrealised numbers showing muscle, bone density and height.

Imo, if we took tribe numbers now and went back to old world cave and stick we would see similar problems as we do today.

And yes agree about participation within one or more tribes, very similar to prisoner's dillema but with n>2 participants this time, and defection therefore has more of a payoff for every n.