Anchoring Bias
What is Anchoring Bias?
Anchoring bias is the tendency to rely too heavily on the first piece of information (the anchor) when making decisions.
An initial number, like a sticker price, pulls later judgments toward it, even if it's arbitrary. Sellers exploit anchoring with high list prices and 'was/now' discounts.
Anchoring Bias: a worked example
A seller lists a used bike at $480. Buyers who see that number counter around $400 and the deals close near $430. Run the same bike, same photos, same condition past a second group with a list price of $300: counters come in around $250 and deals close near $275. The bike did not change. The two opening numbers differ by $180 and the two settlements differ by $155, so in this scenario roughly 86% of the anchor gap carried into the final price (155 ÷ 180 = 0.86). That is why a seller's first number is rarely an accident.
The mistake students make with anchoring bias
Most people assume an anchor only works if the number is credible, and that seeing through it is enough to escape it. Neither holds. Anchors pull judgments even when the number is visibly arbitrary and even when the effect has been explained in advance, which is why experts drift too. The separate trap is calling every move toward a price a bias. If the seller genuinely knows the item's worth, the list price carries information and updating toward it is sensible.
Anchoring Bias questions
How do stores use anchoring bias in pricing?
Retailers use anchoring by putting a high number in front of you before the real one. A was-$120-now-$79 tag makes $79 read as a $41 saving rather than as a price to judge on its own. Menus do it with one very expensive dish that few order but that makes the next tier look moderate. Suggested retail prices, quantity limits and pre-set donation amounts all work off the same first-number pull.
How do you avoid anchoring bias?
Avoiding anchoring bias means fixing your own number before you see anyone else's. Work out what the item is worth to you, or what the job should pay, and write it down before opening the listing or the offer letter. Then argue the other side deliberately by listing three reasons the anchor is too high. Getting an independent valuation from someone who has not seen the asking price helps for the same reason.
Is anchoring bias the same as the framing effect?
Anchoring bias and the framing effect are cousins, not twins. Anchoring is about a starting number pulling a numerical judgment toward it, such as a list price, a first salary figure or an initial estimate. Framing is about the wording of otherwise identical options, such as calling a treatment 90% survival instead of 10% mortality. Anchoring needs a number to anchor on, while framing works on descriptions with no number in sight.
Related terms
Common comparisons
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