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I have been arguing for years  from repeated observation  that smaller communities are kinder and more caring than bigger ones and this, "cooperation can spontaneously break out even among fundamentally selfish agents  provided you assume that people meet each other more than once, and can remember what the other person did last time they tried to strike a bargain," finally gives me a logical reason for it: you can "assume that people meet each other more than once" in a small community but not in a bigger one.
Thanks!!