How can anchoring bias affect a price judgement?

Anchoring can affect a price judgement when an initial number pulls a later estimate towards it, even when that number deserves little weight. The important comparison is what people estimate after different starting values while the relevant product information stays the same.

An original comparison

Imagine two groups judging the resale price of the same used drawing tablet. Everyone sees identical photographs, age, condition and specifications. Before estimating, each person answers a comparison question containing a number chosen without reference to the tablet's value.

These estimates are invented to illustrate the predicted pattern. They are not observed research results or a valuation of an actual tablet. The 40-pound difference between the example estimates would be compatible with anchoring, but real evidence would require data from participants.

A person may start near the suggested value and not adjust far enough away from it. An anchor might also make features that fit it easier to bring to mind: the high value could prompt thoughts about the tablet's capabilities, while the low value prompts thoughts about its wear. Finding an anchoring effect alone does not tell us which of these processes produced it.

What would make the comparison convincing?

Randomly allocate people to the two prompts, keep the product information the same and compare the whole pattern of estimates across the groups, not just two individuals. A group given no anchor could provide a starting point for comparison. Knowledge of the market and whether the number seems informative may affect responses.

Crucially, changing an estimate after seeing a credible recent selling price is not automatically a bias. That price may be relevant evidence. To test whether an irrelevant number influences judgement, an arbitrary number provides a clearer comparison. A seller's price is harder to interpret because it could communicate genuine information about quality.

Distinguish anchoring from framing

Suppose both offers show an original price of 100 pounds and a final price of 80 pounds. One highlights "Save 20 pounds"; the other highlights "Pay 80 pounds". The available price information stays identical, while the emphasis changes: that is a framing comparison. An anchoring comparison varies the initial reference number and examines how later estimates shift.

The processes can overlap in advertising, so identify what was actually changed. To assess a purchase, independently compare similar products, condition and completed sale prices. Replacing one seller's opening number with a range based on evidence changes the basis of the judgement, although it does not guarantee freedom from bias.

Explore anchoring beyond this tablet example in the Psychology cognitive-approach questions.