Comparison pricing shows a higher figure alongside the price being charged. It continues to affect decisions even among shoppers who openly distrust the higher number.

Anchoring works on estimates, not beliefs

Judging what something is worth is an estimation task, and estimation starts from whatever value is already in mind. The first number encountered becomes the starting point for adjustment.

Adjustment from that starting point is habitually insufficient. The final estimate lands closer to the anchor than a shopper would choose if asked to value the item with no number present.

Distrusting the anchor does not remove it from the calculation. Scepticism affects the conclusion the shopper reports, while the underlying estimate has already been pulled toward the reference figure.

Most goods have no independently known value

For repeat purchases such as staple groceries or fuel, shoppers hold a reasonably accurate internal price and an implausible anchor simply fails against it.

Most retail purchases are not like that. Furniture, jewellery, luggage and appliances are bought rarely enough that no reliable internal reference exists to contradict the displayed one.

In the absence of a competing figure, the reference price is the only quantitative information available about worth. It fills a gap rather than competing with knowledge.

The gap matters more than either number

What is being evaluated is rarely the price alone. It is the size of the saving, which exists only because a second number has been placed beside the first.

A larger gap makes the transaction feel like a better outcome regardless of the absolute figure, which is why deep reductions from a high reference can outperform a modestly priced alternative.

This is also why the reference number tends to be the part that regulators scrutinise. The saving is manufactured by the comparison, so the comparison has to rest on something real.

Why rules focus on the prior price

Advertising rules in most markets require that a reference price be one the seller genuinely charged, for a meaningful period, before the promotion began.

Some jurisdictions go further and require the reference to be the lowest price applied during a defined window before the offer, which limits the practice of raising a price shortly beforehand.

These requirements do not stop anchoring from working. They constrain the size of the anchor by tying it to trading history rather than to what a merchant would like to display.

Anchors set by the shopper are the durable defence

The effect weakens when a shopper arrives with a figure already in mind, because the estimate then has a starting point that the display cannot supply.

That figure can come from a competing seller, from the price of an equivalent item, or from a budget decided before browsing began. Its source matters less than its existence.

Deciding what an item is worth before seeing what it costs converts the reference price from an input into a comparison, which is a materially different judgement.