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Works well on games.

Only problem is trade isn’t a game.

Or, to put it another way, you have no idea when your opponent will stop playing this game and start playing another one.

Game theory is about decision making. If you reject game theory, you reject rational decision making being possible. Note that game theory is still useful in the context of making good decisions against irrational decision makers. Your "put another way" is merely pointing out that often in real world scenarios the game's rules are often part of the unknown information

Everything involving decisions is a game. Trade is a game

I think "game theory" applies to more situations than the name might imply..

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