In short: Anchoring bias is the tendency to rely too heavily on the first number you encounter, then adjust too little from it. It shapes what you will pay for a house, what salary you accept and when you sell a stock. Knowing about it helps only partly, so the better defense is building your own number first.
What the research found
The classic demonstration comes from Amos Tversky and Daniel Kahneman in the 1970s. Participants watched a wheel of fortune, rigged to stop on either 10 or 65, and were then asked what percentage of United Nations members were African countries. Those who saw 10 estimated about 25%. Those who saw 65 estimated about 45%. The wheel plainly had nothing to do with geography, and it moved the answers anyway.
In a second test, people had five seconds to estimate a multiplication. Those shown 1×2×3×4×5×6×7×8 gave a median estimate of 512. Those shown 8×7×6×5×4×3×2×1 gave 2,250. The true answer is 40,320. Both groups started with the first few numbers, projected from there, and landed far too low.
Expertise offers less protection than you might expect. In a study by Northcraft and Neale, both students and real estate agents were swayed by a house’s listing price, and the agents denied that it had influenced them.
Where anchors cost you money
Anchors appear wherever a number comes before your own judgment. The table shows common examples.
| Situation | The anchor | What it distorts |
|---|---|---|
| Shopping | “Was $200, now $120” | Whether $120 is actually a fair price |
| Real estate | The listing price | What the house is worth |
| Salary talks | Your last salary, or the first offer | What the role could pay |
| Investing | The price you paid, or a recent high | Whether the stock is cheap today |
| Tipping and donations | Preset suggested amounts | How much you give |
| Subscriptions | The most expensive plan shown first | How reasonable the middle plan looks |
Investing offers a particularly costly version. An investor who bought at $100 may treat that figure as the stock’s “real” value and wait for a return to it, although the market has no knowledge of what you paid. A stock that has fallen from $200 to $120 is not necessarily cheap either, since the $200 may have been the error. This pattern often works alongside loss aversion, the discomfort of realizing a loss, and together they can keep people in poor holdings for years.
Salary negotiation is where the first number has the most direct effect, because the opening figure tends to frame all later discussion. We cover the practical side in how to negotiate salary.
Why awareness is not enough
Anchoring seems to work partly through adjustment that stops too early and partly because the anchor brings related thoughts to mind. Knowing about the bias does not switch either process off, as the real estate agents illustrate. The practical defenses therefore change the order in which you encounter information, rather than relying on your intention to ignore it.
Set your number first. Before you see a price or offer, write down what you think it is worth or what you are willing to pay. Comparing that figure with the anchor changes the conversation from “is this a discount?” to “is this within my range?”.
Gather independent references. For large purchases, look for comparable sales, market salary data or several quotes. Multiple independent numbers weaken the pull of any single one.
Consider the opposite. Ask why the anchor might be wrong, or what would justify a very different figure. Generating reasons in the other direction tends to reduce the effect, and a real attempt takes only a minute.
Delay when you can. Sales environments often press for quick decisions, partly because anchors work best when you lack time to think. A pause allows you to look up other prices.
Ignore your purchase price. When reviewing an investment, ask a clean question: would I buy this today, at this price, given what I know? What you paid is a sunk cost, and it does not change the answer.
Using anchors honestly
The effect can work for you too. In a negotiation, going first with a well-researched figure can set the frame, provided the number is defensible. An extreme demand may backfire and damage trust, so the anchor should sit at the ambitious end of what you can actually justify.
You can also set helpful anchors for yourself. A savings target expressed as a share of each raise, or a written maximum price before you enter a dealership, provides an internal reference point that competes with the external ones. These small commitments are part of the broader approach in personal finance basics and the psychology of money.
Anchoring also has close relatives worth knowing. Mental accounting explains why we value identical money differently depending on where it came from, and expected value offers a more structured way to judge a decision without leaning on a single number.
Frequently asked questions
Is anchoring the same as a first impression?
They are related but different. A first impression concerns a judgment about a person or situation that colors later views. Anchoring refers specifically to estimates being pulled toward a reference point, often a number, even when that number is irrelevant. Both show how early information carries more weight than it should.
Do discounts always rely on anchoring?
Not always, since many discounts are real. The reference price does a lot of work, however, and it may not reflect what the item normally sold for. Checking a price history tool or several retailers tells you whether the “before” number means anything, which is the part of the deal the shop controls.
Does expertise protect against anchoring?
Only partly. Studies of real estate agents and legal professionals found experienced people remained affected, even by arbitrary numbers. Expertise helps mainly by supplying better reference points to compare against. Experts who rely on structured methods and independent data tend to be better protected than those trusting their judgment alone.
Can anchoring affect how I judge my own finances?
Yes. A past high in your portfolio can make a healthy balance feel like a loss, and a colleague’s salary can change how you feel about your own. Tracking progress against your own goals, rather than against the highest number you remember, offers a more useful reference point.
