Claims about savings are regulated in most markets, and the rules address the mechanics of the claim rather than whether the price is reasonable.

A saving claim is a factual statement

Advertising a reduction asserts that the item was previously available at a higher price, which is a claim about the seller's own trading history.

Being a factual assertion, it can be assessed against records, and sellers are generally expected to be able to substantiate it if asked.

This is why the substantiation requirements attach to the prior price rather than to the promotional price, which is simply what is being charged.

Availability is part of the claim

An advertised offer normally implies that reasonable quantities are available, and promoting something that cannot realistically be supplied is treated as misleading.

Where availability is genuinely limited, the limitation is expected to be disclosed clearly rather than discovered by shoppers who respond to the advertisement.

This is the basis of rules against advertising an offer principally to attract shoppers who will then be directed toward a different purchase.

Conditions must be visible before the decision

Minimum spends, exclusions, membership requirements and time limits all change what an offer is worth, and disclosure after the decision is generally insufficient.

The expectation is that material conditions appear alongside the claim rather than in separate terms that a shopper would have to seek out.

Where an offer cannot be described accurately without its conditions, presenting the headline alone is the problem regardless of what the terms say.

Total price disclosure has tightened

Rules in several markets now require the full amount payable to be shown early, including unavoidable fees and charges added later in a booking process.

The practice of revealing mandatory charges only at the final step has been a specific focus of enforcement across travel, events and subscription services.

Optional extras remain separable, but the boundary between optional and unavoidable is where most disputes in this area arise.

Enforcement varies by market

Some jurisdictions rely on self-regulatory bodies handling complaints, while others give statutory regulators direct powers including financial penalties.

The underlying principles are broadly similar across markets, but the thresholds, reference periods and remedies differ enough that compliance is handled separately in each.

Because the rules are revised periodically, a practice that was acceptable in a market some years ago may no longer be, which is why displays change without any change in commercial intent.