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De Mesquita argues that people always behave out of self-interest. In the car-buying game, the dealers want you to buy the car from them and nobody else. If threatened in the manner de Mesquita describes, they're left with two choices: either give you the lowest price they possibly can or assume you're bluffing – that you won't call anybody else. The latter choice is foolishly risky and an unlikely one for the dealer to make. But in either case, if you've cast your net wide enough, you're covered.
