Sample frameDay 129·Negotiation · Trade

Morning. Splitting the difference isn't fairness. It's what two people do when neither has found out what the other wants most.

Negotiation.

The Exchange Rate

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The question

Take the deal closest to closing and rank its issues twice, once by what conceding each would cost you and once by what winning each is probably worth to them. Can you point to the row that's cheap on your list and expensive on theirs? If the two rankings come out looking the same, you have ranked one side of the table twice, and every swap you price this week will be priced off that single sketch.

The idea

Dean Pruitt, a social psychologist at the State University of New York at Buffalo, spent a career putting people into laboratory bargaining and recording what they actually did, then set the results out in Negotiation Behavior (1981). His contribution was a catalogue: the handful of structural ways an agreement can be made better for both sides at once. The one that does the most work is logrolling. Where two parties rank the issues differently, each concedes on what it cares about least and holds firm on what it cares about most, and both finish ahead of where an even split on every issue would have left them. The requirement is a difference in priority, which is why Pruitt gave as much attention to how negotiators uncover that difference as to the trade itself. You can't swap across a priority you never found. The trap is the even split: give a little on everything and you look reasonable, feel fair, and hand over things the other side would gladly have paid for.

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