A discount only means something relative to a reference, and how that reference is established turns out to be the whole substance of the practice.
What a reference price is
The higher figure a discount is measured against, generally presented as a previous or recommended price.
Which anchors the shopper's sense of value before they assess the item itself.
The anchoring effect is one of the better-replicated findings in behavioural research and is why the practice persists.
The prior price rule
Several jurisdictions require a reference price to have been charged for a defined period.
Which was introduced because retailers were setting brief high prices purely to enable a discount claim.
Common formulations require the lowest price applied over a preceding period rather than merely a price that was once charged.
Recommended retail prices
A manufacturer's suggested figure, which may bear little relation to what anyone actually pays.
Which makes discounts against it structurally misleading for products that are never sold at that price.
Regulators have taken action where such figures were essentially fictional.
Was-now pricing
The most common presentation, and the one most scrutinised.
Which requires the previous price to have been genuine and available.
Enforcement has focused on how long the higher price applied and in how many locations.
Permanent sales
Some retailers operate in a near-continuous state of promotion.
Which raises the question of what the price actually is.
This has attracted attention from consumer authorities in several markets over the years.
Price tracking
Browser tools and websites record price history for many products.
Which lets a shopper check whether a discount reflects an actual reduction.
Doing this once for something you were about to buy is frequently instructive.
Personalised pricing
Different prices shown to different users based on data held about them.
Which is legal in many places subject to disclosure requirements, and it is difficult to detect.
Comparing prices in a private browsing session occasionally reveals differences.
What to actually do
Decide what the item is worth to you before looking at the discount.
Which removes the anchor's influence entirely and is harder than it sounds.
Checking price history takes seconds and answers the question the reference price is designed to obscure.
Drip pricing
Additional charges revealed progressively through a purchase process.
Which makes comparison difficult and has been targeted by regulators.
Rules requiring total price disclosure upfront have been introduced in several markets, particularly for travel and ticketing.
Partitioned pricing
Splitting a price into a base and separate charges.
Which makes the headline appear lower and has been shown to increase purchase likelihood.
Delivery charges are the most common example in general retail.
Charm pricing
Ending prices just below a round number.
Which has been studied extensively with mixed but generally supportive findings for its effect.
Its persistence across essentially all retail suggests it works well enough to keep using.
Decoy options
An option included to make another look better by comparison.
Which is a well-documented effect in choice research.
Three-tier pricing structures frequently exhibit it, with the middle option the intended choice.
Regulatory direction
Consumer authorities in multiple jurisdictions have increased scrutiny of pricing presentation.
Which has produced enforcement actions and updated guidance for retailers.
Published guidance is generally clear about what is and is not acceptable.
Dynamic pricing
Prices adjusted automatically in response to demand, competitor pricing and inventory.
Which is now standard in online retail and produces frequent changes on the same item.
Repricing software monitoring competitors runs continuously across large catalogues.
Price matching
Policies promising to match a competitor's lower price.
Which carry conditions about which competitors qualify and over what period.
They reduce the incentive to shop around, which is part of their commercial purpose.
Loyalty pricing
Lower prices for scheme members on selected items.
Which raises the question of whether the non-member price is the genuine one.
Consumer authorities have examined this practice in grocery retail specifically.
Shrinkflation
Reducing pack size while holding price.
Which is a price increase presented as continuity.
Unit pricing on shelf labels is what makes it visible, and it is required in many jurisdictions for that reason.
What actually helps
Deciding a maximum before looking, checking price history, and treating the crossed-out figure as marketing rather than as information.
Which is straightforward advice that runs against a great deal of well-designed persuasion.
Consumer authorities publish guidance on what pricing claims must satisfy, and it is worth reading once.
The underlying point
A discount is a claim about a comparison, and the comparison is chosen by the party making the claim. Once you see it that way, most promotional pricing becomes legible rather than persuasive.
Where to complain
Misleading pricing can be reported to consumer protection authorities.
Which act on patterns rather than on individual cases and use reports to identify them.
Reports are free to make and take a few minutes.