Cognitive Principles
Anchoring Effect
The first number or fact a person sees disproportionately shapes every judgement that follows.
Where it comes from
It was demonstrated by Daniel Kahneman and Amos Tversky in the 1970s, in experiments where an obviously random number — even one from a spin of a wheel — measurably shifted people's later numerical estimates. The first figure sets a reference point the mind can't fully shake.
Why it matters for your website
The first number seen frames every number after it. Kahneman's anchoring research shows whatever figure appears first disproportionately shapes how the rest is judged. Pricing, features, and value claims are all affected by what the visitor encounters first.
The anchor doesn't have to be relevant to do its work. Once a number is in view, every later judgement is made *relative to it*, often without the person realising. This is why showing a higher-tier price first makes the mid-tier feel reasonable, and why a 'was £200, now £120' framing lands harder than '£120' alone.
It cuts both ways, which is the warning. A carelessly placed low number can anchor visitors below what you're worth; a hostile review or a competitor's headline price can become the anchor you're then judged against. The first figure a visitor meets is rarely neutral, so it's worth choosing deliberately.
Wrong vs right
A pricing page leading with the cheapest plan, anchoring visitors low so the premium tiers feel expensive by comparison.
Leading with the highest-value plan (or showing them high-to-low), so the recommended tier reads as reasonable against it.
A discount shown only as the final price, with no reference point to make the saving felt.
An honest original-price anchor ('£200, now £120') so the value of the offer is legible.
Letting a competitor's low headline price be the first number the visitor associates with the category.
Establishing your own value anchor — the cost of the problem, the value delivered — before price enters.
Understanding Anchoring Effect
The anchoring effect is the mind's habit of latching onto the first piece of numerical information it encounters and using it as the reference point for everything that follows. Subsequent judgements are made by adjusting away from that anchor — and the adjustment is usually insufficient, so the final estimate stays biased toward wherever the anchor sat. Strikingly, this happens even when the anchor is obviously arbitrary.
On a commercial page, anchors are everywhere whether you place them or not. The first price a visitor sees frames how they judge every other price. The order of plans, a struck-through 'original' figure, the headline number in a value claim, even an unrelated statistic — all set reference points. The question isn't whether anchoring is happening; it's whether you've chosen the anchor or let it choose itself.
The honest application is to anchor against genuine value, not to deceive. A real original price, the true cost of the problem you solve, or your highest-value option are all legitimate anchors; a fabricated 'was' price is simply a lie with a number on it. Anchoring works alongside framing and loss aversion as part of how people judge worth in context.
How Kweri checks it
Kweri can observe where the key numbers on a page fall — pricing order, the presence or absence of reference points, what figure a visitor meets first — and prompt you to consider whether that first anchor is working for you. What it can't judge is the truthfulness of an anchor: whether a struck-through price was ever the real price is a business fact, not something visible in the page. So Kweri surfaces anchoring opportunities and ordering choices, while leaving the integrity of any reference price to you — and it's designed to encourage honest anchors, not invented ones.
FAQ
What is the anchoring effect?
The anchoring effect is the tendency to rely too heavily on the first piece of information — often a number — when making decisions. That initial 'anchor' biases all subsequent judgements, which adjust away from it but rarely far enough.
How is anchoring used in pricing?
By controlling which number a visitor sees first. Showing a higher-value plan or an honest original price first creates a reference point that makes the target price feel reasonable. The ordering and framing of prices shapes perceived value.
Who discovered the anchoring effect?
Daniel Kahneman and Amos Tversky demonstrated it in the 1970s, showing that even arbitrary numbers influenced people's later estimates. It's a core finding of behavioural economics.
Does the anchor have to be relevant?
No — that's what makes the effect so strong. Experiments show even obviously random or unrelated numbers shift later judgements. This is why stray figures on a page can anchor perception in ways you didn't intend.
Is anchoring ethical to use?
When the anchor is genuine — a real original price, the true value or cost involved — it's just clear framing. When the anchor is fabricated, like a fake 'was' price, it's deceptive and risks both trust and, in many markets, the law.
Related principles
The pain of a loss is roughly twice as strong as the pleasure of an equivalent gain.
Too many options causes paralysis — people often choose nothing when faced with abundance.
The probability of conversion is a function of five weighted factors: C = 4m + 3v + 2(i–f) – 2a. Motivation is the most important factor (×4), followed by value proposition clarity (×3), with incentive, friction, and anxiety each having significant but lower weight (×2).
Attribution & sources
Identified by Daniel Kahneman and Amos Tversky (1970s). Catalogued from Anchoring research (Kahneman & Tversky).
Demonstrated experimentally by Kahneman and Tversky; there's no single canonical web source. A foundation of behavioural economics.
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