Anchoring bias: why the first number wins

When you see a price, a salary offer, or an asking price for a house, the first number you encounter shapes every judgment that follows. This is anchoring bias: the tendency to rely disproportionately on an initial piece of numerical information when making estimates or decisions, even when that number was set by someone with opposing interests or is entirely arbitrary.

The effect was named and documented by Tversky and Kahneman in 1974. Decades of subsequent research have found it operating reliably across retail purchases, salary negotiations, real estate transactions, and legal settlements. Understanding how it works makes it possible to work around it.

What anchoring bias is

In their 1974 paper "Judgment under Uncertainty: Heuristics and Biases," published in Science, Amos Tversky and Daniel Kahneman described a consistent pattern: when making numerical estimates, people start from an initial value and adjust from it. The adjustment is almost always insufficient. The starting number, the anchor, disproportionately shapes the final estimate even when subjects knew the anchor was random.

In one of their original experiments, subjects were shown a number from a spinning wheel and then asked to estimate what percentage of African nations were in the United Nations. Estimates were significantly higher for those who saw a high number and lower for those who saw a low one. The anchor was not just irrelevant. It was explicitly random, and it still moved the estimates.

The critical feature for financial decisions: anchors set by sellers are not random. They are chosen to anchor you high.

Anchoring in retail pricing

"Was $200, now $120" is anchoring in plain form. The original price of $200 creates a reference point that makes $120 feel like a meaningful discount, regardless of whether $120 is actually a fair price for the item. If you had encountered the item priced at $120 with no original price shown, your evaluation would be unaffected by the $200 that never appeared.

The same dynamic underlies manufacturer's suggested retail price (MSRP) on vehicles. The MSRP is an anchor set by the manufacturer, typically well above what most buyers pay, that makes any negotiated price feel like a win even when it is still above market. The anchor's purpose is to shift the reference point in the seller's favor.

Sale events framed as time-limited ("This weekend only") apply the same mechanism using urgency rather than price. The framing is designed to prevent independent price research that might reveal what the item actually costs elsewhere.

Anchoring in salary negotiation

Whoever names the first number in a salary negotiation sets the anchor for the entire conversation. Galinsky and Mussweiler, in a 2001 paper in the Journal of Personality and Social Psychology, found that first offers systematically influence final negotiated outcomes even when the other party consciously tries to adjust away from the anchor. The effect held across different negotiation scenarios and did not disappear when subjects were told about anchoring in advance.

The practical implications:

If you name the first number and it is well-supported by market data, you set the anchor in your favor.
If the employer names a number first, that number becomes the reference point from which you adjust, even if it is below market.
Counter-move: form your own target independently before the conversation begins, grounded in salary survey data for your role, level, and location. When their number arrives, you have your own anchor to hold against it.

For the full framework on preparing for that conversation, see how to ask for a raise.

Anchoring in real estate

List price is an anchor. Research on real estate negotiation has consistently found that buyers who see a higher list price form higher estimates of property value and make higher offers. The effect persists even when buyers are instructed to ignore the list price and even among experienced participants.

The counter-move is to research comparable recent sales before viewing a property or learning its list price. If you form your own value estimate from transaction data first, the list price becomes new information you can evaluate against your estimate, rather than an anchor you adjust from.

How to counter anchoring

Awareness of anchoring reduces but does not eliminate its effect. The research is clear on this: knowing about anchoring does not make you immune to it. What helps is replacing the anchor's role with independent reference points formed before exposure.

Practical moves:

Form your own number first. Before entering a negotiation, a store, or a property viewing, decide what the thing is worth to you and what you are willing to pay. Your estimate then serves as a counter-anchor.
Evaluate on its own terms. Ask "would I buy this at this price if the original price were never shown?" rather than "how good a deal is this relative to the anchor?"
Research independently. Salary surveys, comparable sales, alternative vendors, price-tracking tools: any independent data source gives you reference points not controlled by the party who wants to anchor you.
Name your reframe explicitly in negotiations. If you have been given an anchor, saying "I'd like to set that aside and look at what the market data shows" makes the reframe explicit and shifts the conversational reference point.

None of these eliminate the anchor's pull entirely. They work by giving you something to hold against it.

Common mistakes

Treating "X% off" as evidence of a good deal. A discount percentage is a discount from the anchor, not from fair market value. The anchor may have been set high to make the discount look larger.
Letting the other party always name the first number. In negotiations where you have done the research, naming your number first tends to anchor in your favor. Waiting passively cedes that advantage.
Evaluating only relative to the anchor. The question is not whether the price is lower than the starting point. The question is whether the price represents good value on its own terms.

Sources

Tversky, A. & Kahneman, D. (1974). "Judgment under Uncertainty: Heuristics and Biases." Science, 185(4157), 1124-1131.
Galinsky, A.D. & Mussweiler, T. (2001). "First Offers as Anchors: The Role of Perspective-Taking and Negotiator Focus." Journal of Personality and Social Psychology, 81(4), 657-669.

Educational content, not financial, investment, tax, or legal advice. Last updated July 2026.