Price Errors, Adverts and Whether a Shop Must Honour the Number

Everything below about mistakes in advertised prices comes from what actually happens rather than from what is supposed to.

Why the display is not an offer

Most systems treat a price on a shelf or a website as an invitation to make an offer rather than a binding offer. The customer offers to buy at that price, and the seller accepts or declines when processing the order. This structure is why a shop can generally decline to sell at an obviously wrong price before accepting.

It is also why order confirmations are worded so carefully, since they mark the point of acceptance. The precise rules on formation differ between jurisdictions, though the general structure is widely shared.

Once acceptance happens

After a contract is formed, refusing to supply becomes a breach rather than a declined offer. Retailers therefore word automated acknowledgements to confirm receipt without accepting the order. Dispatch is frequently the stated point of acceptance, which gives the seller time to catch pricing errors.

Whether such wording works in a given case depends on how clearly it was presented to the customer. This is a well-litigated area, and outcomes vary considerably between legal systems.

Obvious errors and unconscionable bargains

Where a price is so wrong that any reasonable person would know it was a mistake, systems often decline to enforce it. Doctrines of mistake, and rules against taking advantage of an obvious error, do work of this kind. A modest discrepancy is treated differently from a price that is off by a factor of a hundred.

Bulk orders placed within minutes of a pricing error appearing tend to undermine any claim of innocent reliance. How these doctrines apply is a technical question that varies substantially by jurisdiction.

Regulation of misleading pricing

Separately from contract law, most countries regulate misleading pricing and advertising practices. Rules commonly address reference prices, claims about discounts and the presentation of unavoidable additional charges. These regimes are enforced by regulators rather than by individual customers seeking the advertised price.

Reporting a pattern of misleading pricing is different from claiming a bargain and is often the more useful step.

The applicable regulator and the rules it enforces are entirely national.

Additional charges at checkout

Charges revealed only at the final step are a recurring regulatory concern in many markets. Rules increasingly require that unavoidable costs be included in the headline price shown to consumers. Optional extras pre-selected by default have also attracted specific restrictions in several jurisdictions.

As a general position, comparing the total payable rather than the advertised figure is the practical defence for any shopper. Screenshotting the price shown at each stage helps if a discrepancy needs to be raised later.

What to do about a suspected error

Ask politely, since many retailers honour small errors as a matter of goodwill and customer relations. Where the discrepancy is between a shelf label and the till, raising it at the point of sale is the moment that matters. Keeping a photograph of the displayed price is far more persuasive than describing it afterwards.

Where the error is obvious and enormous, expectations should be adjusted accordingly. Persistent misleading pricing is a matter for the regulator rather than for an individual argument.

The takeaway

The moment of acceptance decides almost every price error argument. General explanation, and not legal advice.

Understanding a process is not the same as being represented in it.