•In the real world, reputation helps resolve this. In online, the ability to change your identity negates it.
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•Tracking negative reputation starts out good, then crumbles over time
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•In open systems, the most advantageous strategy is Tit for Tat, e.g. a positive feedback after the fact rep
system.
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•Tracking positive reputation starts out bad but builds over time to be almost as good as a closed system