The fundamentals
Cognitive biases in negotiation
Our decisions are not rational. Daniel Kahneman and Amos Tversky proved it: systematic mental shortcuts distort our judgement. Knowing them, in the other side and in yourself, is already taking back control.
Two speeds of thinking
Kahneman distinguishes two systems: one fast and intuitive, economical but fallible, and one slow and analytical, reliable but costly. Under pressure or in a hurry, the first one decides, and that is where biases rush in. Prospect theory adds that losses weigh about twice as much as equivalent gains.
The biases that weigh most
The first number stated sets the reference for the whole discussion, even when it is arbitrary.
Believing that whatever one side gains, the other loses, and missing the value that could have been created.
Overestimating your position, your BATNA, or the odds that the other side will give in.
Keeping only the information that confirms what you already believed.
Winning the auction or the standoff... having paid far too much.
Anchoring in practice
Of all the biases, anchoring is the one that shows up most directly in money. The first number on the table pulls the final deal towards it, even when both sides know it is arbitrary. Hence a practical consequence: when you are well informed about the value at stake, it is usually to your advantage to anchor first, with an ambitious but defensible figure. An indefensible anchor backfires: it damages credibility instead of moving the reference.
Against the other side's anchor, the counter is not to counter-offer at once, which means negotiating inside the frame they set. It is to defuse it explicitly: name the figure for what it is, ask how it was built, then reset the discussion on your own references. You do not neutralise an anchor by ignoring it, you neutralise it by replacing it.
Guarding against yourself
Set out in writing your target, your reservation price and your ZOPA estimate before the first exchange. What is written before resists what is said during.
Give a third party, or yourself in writing, the job of defending the opposite reading of the file. Confirmation bias only yields to organised contradiction.
Imagine the signed deal turned out badly a year on, and look for why. The exercise surfaces the risks that enthusiasm was hiding.
Ultimatum, surprise offer, sudden deadline: these are the moments the fast system decides. A pause, even a short one, hands control back to the slow system.
When the other side gives in quickly, the winner's curse is not far. Ask what they know that you do not.
Knowing the biases is not enough
The most counter-intuitive point in Kahneman's work: knowing a bias exists does not stop it acting. Anchoring works on negotiators who know about anchoring. Protection therefore comes not from awareness but from procedure: numbered markers set down beforehand, planned pauses, an outside eye. That is the whole difference between an informed negotiator and an equipped one, and it is precisely the role of preparation.
Sources
- Daniel Kahneman and Amos Tversky, « Prospect Theory » (1979).
- Daniel Kahneman, Thinking, Fast and Slow (2011).
- Max Bazerman and Margaret Neale, Negotiating Rationally (1992).