According to the conclusion of The Evolution of Trust, what are the conditions needed for a trusting society to develop and maintain itself over time?

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an external enforcer who isn't part of the game but will punish the players who aren't cooperative

low miscommunication

one$-$shot interactions

homogeneous populations, where every player is of the same type

repeated interactions

non$-$zero$-$sum games where it's possible for both players to benefit from cooperating