Anchoring

It changes what you estimate, reliably: anchoring replicated strongly across 36 samples and sways judges and estate agents. Its effect on what people will pay is real but smaller than early studies claimed, and weaker still with real money. Listing reasons the anchor is wrong reduces its pull.

What the report found

1. The basic effect is among the most reliable in psychology. In a large replication project across 36 samples, anchoring repeated consistently and strongly. When people estimate an uncertain number, a number they have just seen pulls their answer towards it.
2. Experts are not immune. Experienced judges gave longer sentences after rolling a die that showed a higher demand, and estate agents' valuations moved with a listing price they said they had ignored.
3. Effects on what people will pay are real but smaller than first reported. A famous study found that people with higher social security numbers would pay about three times as much for the same goods. Later replications found weaker effects, and a meta-analysis of 53 studies found a moderate effect, smaller than early studies suggested.
4. Real money shrinks the effect. Across 16 field studies with nearly 22,000 real payments, anchors still moved what people paid, but less and less predictably than in hypothetical questions.
5. The anchor can be loosened. Asking people to think of reasons why an anchor is wrong reduced its pull, even among experts. The first number sticks most when nobody questions it.

What is inside

1. The idea and where it came from
2. The original studies, explained
3. What happened when others tested it
4. Where researchers disagree
5. What we can say with confidence

Plus a fifty-year timeline, a table of where anchoring is strong and weak, a graded list of claims and a five-question checklist.

Who it is for

For anyone who sets prices, negotiates, estimates or advises, and anyone who wants their own judgements less swayed by the first number.

How we work

Evidence Reviews follow one idea from its first studies to its latest tests. Every claim is graded Established, Emerging or Untested. Where researchers disagree, as they do on how much anchoring matters in real markets, both sides are set out before we say where we stand.

Cite this report

The Why We Project (2026) Anchoring: How the first number shapes the rest. Evidence Review No. 04. Dubai: Why We Tech Ltd. Available at: thewhyweproject.com