Anchoring in negotiation: how to make the first offer and defend against theirs

What the anchoring effect is

Anchoring is a cognitive bias described by Amos Tversky and Daniel Kahneman in 1974. People rely on the first number they hear, even a random one, and adjust away from it too little.

In negotiation the first number sets the frame. If a supplier opens with a 25% price increase, ending at 12% feels like a win, even though you expected 0%.

When to name a number first

• 01You know the market and the likely ZOPA well: go first.
• 02You have little information and they have more: ask questions first, or you risk anchoring against yourself.
• 03They have already named an aggressive number: put a counter-anchor on the table quickly without discussing theirs.

How to set a strong anchor

• 01Ambitious: near the edge of what you can justify.
• 02Precise: "$18,700" sounds more researched than "about twenty thousand".
• 03Reasoned: cite a criterion such as market data, the cost of an alternative, or value to the client.
• 04With room to concede: leave space to move and keep a sense of reciprocity.

How to neutralise their anchor

Do not repeat or debate their number; every mention strengthens it. Calmly say the offer is outside your range and steer back to objective criteria or your counter-offer.

A useful move is to ask for the basis: "What is that number based on?" An unjustified anchor loses power as soon as it has to be explained.

Anchors and concessions

After the anchor, the pattern of concessions matters. Shrinking steps (10% → 5% → 2%) signal you are nearing your limit. Trade every concession for something: "If you sign for two years, we can discuss price."

Anchoring in NEGOTIA

In the Vendor Price Increase scenario the AI opponent opens with an aggressive anchor. Your debrief shows an Anchoring skill score: whether you held your reference point, justified your counter-offer and how much each concession cost you.