When every shop shows the same number, something upstream decided it

These are listed in the order worth acting on, which with why identical prices appear everywhere is not the order they are usually presented in.

The ordinary explanations first

Where several retailers buy the same item from the same supplier on similar terms, their underlying costs are close to identical. Add a conventional margin for the category and the resulting prices land in the same place without anybody coordinating anything.

Familiar price points pull the results together further, because everyone rounds toward the same small handful of figures. Automated repricing tightens the cluster again, since systems that watch competitors converge on one another by design. Most identical pricing is explained by these mechanisms alone, and no arrangement of any kind is required to produce it.

The recommended figure as a default

Suppliers often publish a suggested price, and where a retailer has no particular reason to differ, the suggestion simply becomes the price. Deviating downward starts a conversation with rivals and reduces margin on an item that was already selling perfectly well.

Across a sale weekend, deviating upward risks looking expensive on a product that shoppers use to judge the whole shop against. The path of least resistance is therefore to take the suggested figure, which is precisely why suppliers publish one. This is not an instruction and generally carries no obligation, but it shapes behaviour without needing to be one.

Restrictions on advertising rather than on selling

Some supply arrangements limit the price at which a product may be advertised while leaving the actual selling price alone. That produces the familiar pattern where every listing shows the same figure and the real number appears only in a basket or after contact.

The stated rationale is usually protection of a market position and of retailers who provide demonstration, service and support. The effect on a shopper is that comparison gets harder, because the visible numbers no longer distinguish between sellers at all. Whether such arrangements are permitted, and in what form, depends on the competition regime in each individual country.

Where the law tends to draw the line

Many jurisdictions distinguish between a supplier recommending a price and a supplier requiring one, treating the second far more harshly. Agreements between competing sellers about price are treated as serious matters almost everywhere, with substantial consequences attached. The detail differs by country and by the type of arrangement, and enforcement priorities shift over time as well.

Nothing here is an assessment of any particular company or arrangement, which is a matter for regulators who have the actual facts. The practical point for a shopper is that identical prices are ambiguous evidence and usually have an innocent explanation.

How to tell the situations apart

If every seller shows an identical figure but the baskets differ, the difference is being moved into delivery, bundles or membership pricing. If prices are identical everywhere and never move at all, the item is probably held to a recommended figure nobody has a reason to break. If a listing says the price will be shown in the basket, that is generally an advertising restriction rather than a technical quirk.

Per unit, where prices vary widely, comparison is worth real effort, and where they do not vary, that effort is better spent elsewhere. Reading which situation you are in saves the time otherwise spent searching a market that has nothing in it to find.

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

What actually moves a uniform price

Uniform prices break when a successor model arrives, when a season ends, or when a particular seller decides to clear stock. They also break for members, for bundled purchases and for anyone buying more than one thing in a single transaction. Independent sellers and second-hand channels sit outside the arrangement entirely, and that is where variation usually appears first.

Waiting for the category event is generally more productive than searching for a seller who has broken ranks today. In a market that shows one number everywhere, timing is the only variable you actually have left to work with.

Everything above, in order of what to do first

1. The ordinary explanations first. Where several retailers buy the same item from the same supplier on similar terms, their underlying costs are close to identical.
2. The recommended figure as a default. Suppliers often publish a suggested price, and where a retailer has no particular reason to differ, the suggestion simply becomes the price.
3. Restrictions on advertising rather than on selling. Some supply arrangements limit the price at which a product may be advertised while leaving the actual selling price alone.
4. Where the law tends to draw the line. Many jurisdictions distinguish between a supplier recommending a price and a supplier requiring one, treating the second far more harshly.
5. How to tell the situations apart. If every seller shows an identical figure but the baskets differ, the difference is being moved into delivery, bundles or membership pricing.
6. What actually moves a uniform price. Uniform prices break when a successor model arrives, when a season ends, or when a particular seller decides to clear stock.

The takeaway

Where every seller shows one number, stop hunting for a cheaper seller and start watching for the event that breaks the pattern.

The cheapest purchase is still the one you did not make.