They moved the bread again, and they know exactly where they moved it

There is a short answer about supermarket layout changes and a useful one, and they are not the same. What follows is the useful one.

A confused shopper walks further and buys more

A shopper who knows the layout takes the shortest path to a known list, passes few other categories, and leaves quickly with what they intended to buy. A shopper searching for a relocated item walks the aisles, scans shelves and is exposed to a far larger number of products in the process. Unplanned purchases are strongly associated with time in store and with exposure to categories that were not on the list.

Rearranging the layout therefore converts efficient customers back into browsing ones, which is a measurable commercial effect rather than a suspicion. It is presented as an improvement to the shopping experience, and both statements can be true at the same time.

Staples are placed to maximise distance

Milk, bread and eggs are bought frequently and by almost everyone, which makes them the ideal anchors to place far from the entrance and from each other. Positioning them at the back and at opposite corners means a shopper collecting the three most common items traverses most of the shop. The route between them is then populated with higher-margin categories, which is the entire design of a modern grocery floor plan.

Somewhere in the release notes, convenience formats invert this, putting staples near the door, because the customer is buying speed and would leave rather than search. Comparing the two layouts side by side is the clearest possible demonstration of what each format is optimising for.

Shelf position is sold, not sorted

The band roughly between waist and eye height attracts the most attention and the most sales, and it is allocated commercially rather than logically. Payments for prominent placement are standard practice in many markets, and they mean shelf position reflects supplier arrangements as much as popularity.

Products aimed at children are frequently placed lower, which is a well-documented and much-criticised application of the same principle. Own-brand goods are typically placed immediately beside the branded equivalent, so the comparison happens where the retailer wants it. Looking at the top and bottom shelves is the cheapest shopping advice in existence and remains effective precisely because it is effortful.

Unit pricing is the defence they had to be made to provide

Comparing a large box against a small one is arithmetic performed under time pressure while holding a basket, which is where errors live. Many jurisdictions now require price per unit to be displayed on shelf labels, specifically so that comparison does not require mental arithmetic.

Three clicks later, the larger pack is not reliably cheaper per unit, and multi-buy offers are not reliably cheaper than the same items bought singly. Reading the small unit price rather than the large headline price is the single most effective habit available in a supermarket.

It also takes no additional time once you know where on the label to look.

Everything else on the route

The entrance is usually produce or flowers, because fresh, colourful and fragrant goods set an impression of quality that carries through the visit. The bakery vents are frequently positioned to release smell into the shop, which is a straightforward and effective sensory technique. End-of-aisle displays sell disproportionately well and are frequently not discounted, since prominence alone does most of the work.

The checkout queue is stocked with small, cheap, impulse items because it is the one place a shopper is stationary and bored. Every one of these is old, documented and still works, which says more about attention than about supermarkets.

One bad unit is bad luck; a pattern across thousands of buyers is a design decision.

Shopping like a person who has read this

Take a list and treat it as a boundary rather than a suggestion, since the list is the only defence that operates before you enter. Do not shop hungry, which is folk advice that has held up reasonably well in studies of unplanned food purchasing.

Read the terms and there it is: check the unit price on everything you buy regularly, once, and then stop checking until the packaging changes. Use the shop's app or online order for a repeat list, because a search box defeats a floor plan entirely. Accept that the bread will move again, and that being annoyed about it is the correct and only available response.

The takeaway

Read the unit price and look at the bottom shelf.

The fix is usually trivial, which is the most annoying part.