Personalised pricing: what it can and cannot do to you

These are listed in the order worth acting on, which with personalised pricing is not the order they are usually presented in.

What personalised pricing means

Personalised pricing is charging different base prices to different individuals based on data about them, as distinct from varying prices by time or place. Studies and regulatory reviews have generally found it exists but is less widespread than public discussion assumes.

Personalised offers and discounts are much more common, since giving one customer a code is easier to justify than charging another more. The distinction matters because the two feel identical from outside but sit differently in law and in practice. Most of what shoppers notice has a duller explanation.

The duller explanations

Regional pricing accounts for a great deal of variation, since taxes, costs and competition differ between locations. Time-based movement accounts for more, because prices change on schedules that have nothing to do with who is looking. Test groups account for some, as sellers routinely run experiments where a proportion of visitors see a different price.

At the till, and retargeted advertising accounts for the sensation of being followed, which is advertising rather than pricing. Before concluding you were singled out, those four should be ruled out.

How to check

Compare in a clean session, on a different device and network, ideally with someone else looking at the same item. If prices differ, note the exact configuration, delivery address and account status, since all three commonly change a quoted price.

Repeat the check, because a single difference can be a test group or a timing coincidence. Screenshots with timestamps are what make any subsequent complaint meaningful. This is a slightly tedious check and it is the only reliable one available.

Where the law sits

Some jurisdictions require disclosure when a price has been personalised using automated decision-making, and others do not address it directly. Data protection rules also apply to the profiling behind such pricing in many regions, with rights that vary considerably. Pricing that differs on a protected characteristic engages discrimination law in most places, which is a much stronger prohibition.

Because the position varies so much, this is one to raise with your own consumer or data protection authority rather than to assume. General articles cannot tell you your rights here, and this one is not attempting to.

The device myth

The claim that a particular type of device attracts higher prices has circulated for years and evidence for it as a general rule is weak. Where differences have been documented, they have more often involved ranking of results than the price of a given item. That distinction matters, because being shown more expensive options first is not the same as being charged more for the same option.

Sorting explicitly by price defeats ranking effects immediately. It is worth doing regardless of whether any personalisation is happening.

Prices, promotions and terms move constantly, so check the current number rather than this one.

Practical protection

Compare before logging in as well as after, since account status can change what you are shown. Keep a personal record of prices for anything you buy repeatedly, which is the only baseline nobody else controls.

Sort by price explicitly rather than accepting default ordering on any platform. And treat unusually convenient personalisation, such as a discount arriving exactly when you hesitated, as evidence that your behaviour is being observed. Observation is not the same as being overcharged, but it is worth knowing which is happening.

Everything above, in order of what to do first

1. What personalised pricing means. Personalised pricing is charging different base prices to different individuals based on data about them, as distinct from varying prices by time or place.
2. The duller explanations. Regional pricing accounts for a great deal of variation, since taxes, costs and competition differ between locations.
3. How to check. Compare in a clean session, on a different device and network, ideally with someone else looking at the same item.
4. Where the law sits. Some jurisdictions require disclosure when a price has been personalised using automated decision-making, and others do not address it directly.
5. The device myth. The claim that a particular type of device attracts higher prices has circulated for years and evidence for it as a general rule is weak.
6. Practical protection. Compare before logging in as well as after, since account status can change what you are shown.

The takeaway

Rule out region, timing, testing and retargeting before concluding a price was aimed at you personally.

A discount is a claim about a price you were never asked to pay.