Finally, there is reciprocity. This is the most Riverian principle of all, since it flows directly from game theory. Treat other people as intelligent and capable of reasonable strategic behavior. The world is dynamic, and although people may not be strictly rational, they’re usually smart about adapting to their situation and achieving the things that matter most to them. Play the long game. Sure, other people sometimes give you opportunities to take advantage of them. But remember that, in a Nash equilibrium, any attempt to exploit your opponent runs the risk of being exploited in return.
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