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The Anchoring Effect: Why the First Number You See Sticks

One of the first numbers you see can quietly become the "anchor" that every later judgment gets measured against.

Definition: the first number becomes the reference point

In negotiations, price judgments, and estimates, the first number or piece of information you encounter β€” the "anchor" β€” tends to become the reference point for every judgment that follows, with later adjustments rarely moving far from it. The defining feature is that the final judgment stays within the anchor's gravitational pull.

Origin: Tversky and Kahneman's wheel-of-fortune experiment

In 1974, Amos Tversky and Daniel Kahneman had participants spin a wheel rigged to stop on either a low or high number between 0 and 100, then asked them to estimate the percentage of African countries in the United Nations. The group that landed on a high number guessed far higher than the group that landed on a low one β€” showing that even a number known to be random can anchor a completely unrelated judgment.

Everyday example: list price next to a sale price

Showing an original price before a discounted one β€” "was $100, now $50" β€” pulls attention toward the relative saving instead of whether $50 reflects the item's actual worth. The original price works as an anchor regardless of whether it was ever a realistic market price.

How it plays out in negotiation

In salary talks or a real-estate deal, whoever names a figure first tends to narrow the range the rest of the conversation revolves around. Even an opening number that is unrealistically low or high often ends up shaping where the final agreement lands.

How to reduce its pull

Rather than accepting the first number at face value, gathering independent information from multiple sources and questioning why that particular number was presented can help. Researching a reasonable target range before a negotiation is a practical way to avoid being anchored by whatever the other side opens with.

One of behavioral economics' best-known shortcuts

The anchoring effect is one of the most widely recognized heuristics identified by Daniel Kahneman and Amos Tversky. Experiments have repeatedly shown that people are influenced by a number even when they know it has nothing to do with the judgment at hand, and the effect has been documented in contexts ranging from price negotiations to opinion polling to courtroom sentencing.

Practical implications for marketing and negotiation

Many sellers and negotiators deliberately open with a high initial offer to set a reference point in their own favor. Recognizing that an opening number is just one anchor among many possible reference points, not an absolute benchmark, is a useful habit for making a more independent judgment.

Frequently Asked Questions

Does anchoring happen even when the number is completely unrelated to the decision?

Yes. In Tversky and Kahneman's wheel-of-fortune experiment, a number that participants knew was random and irrelevant to the question still shifted their estimates. This shows anchoring can operate independent of whether the number is even a plausible input.

How can I reduce anchoring in my own decisions?

Don't take the first number at face value β€” compare information from multiple independent sources and form your own reference point in advance. Before a negotiation, researching a reasonable target range ahead of time reduces how much the other side's opening figure can pull you off course.