When the price stays the same but you get less
Shrinkflation describes a pattern where a product's package size shrinks while its price stays the same or rises anyway, so the effective cost per unit of the product goes up even though the sticker price looks unchanged or only slightly different. It happens across many categories, but it is easiest to notice in groceries, where package sizes are printed clearly and bought repeatedly, so a change is more likely to be spotted over time than with a one-off purchase.
Why the total price alone hides the change
If a product's total price stays exactly the same while the pack shrinks from a larger size to a smaller one, comparing only the two prices shows no change at all. The only way to see the real difference is to compare the price per unit, per hundred grams, per litre, or whatever measure fits the product, before and after the change. This is exactly what unit pricing is designed to make visible, and it is the reason unit price display next to the total price matters far more for groceries than for most other product categories.
What the rules require, region by region
- In the European Union, the Price Indication Directive requires retailers to display the unit price alongside the selling price for most pre-packaged goods sold by weight, volume, length or area, giving shoppers a standard basis for comparison across different pack sizes.
- In the UK, the Price Marking Order sets out similar unit pricing requirements, with an exemption for smaller shops below a set retail floor area. Reforms extending unit pricing to more packaged goods categories, including items such as cereals and detergents, are being phased in.
- In the US, there is no single federal law requiring unit pricing everywhere. Unit price display exists in many states and is common practice among larger grocery chains, but the requirement and its detail vary by state rather than applying uniformly nationwide.
Reading a unit price correctly
A unit price is only useful for comparison when the unit itself is consistent. Comparing a price per 100 grams on one product against a price per kilogram on another gives a misleading impression unless you convert one of them first. Most online grocery listings standardise the unit within a category, but it is worth double-checking, especially when comparing across different shops that may not use identical measures. Once the units match, the comparison becomes simple: the lower unit price is the better value, regardless of how the total pack price and pack size differ.
Spotting shrinkflation without tracking every purchase
Few people keep a running record of every pack size they buy, so shrinkflation is usually noticed by accident, a pack that feels lighter, a box that looks the same size but has more empty space inside, or a unit price that has quietly risen since the last purchase. Where a shop displays both the pack price and the unit price clearly, a rising unit price over time, even with a stable total price, is the clearest signal that a pack has shrunk relative to its cost. Comparing the same product across two or three shops by browsing relevant categories also helps, since a genuinely smaller pack size is usually visible once placed next to a competitor's listing.
Where discount codes fit into grocery shopping
A voucher code or coupon code reduces the total or a percentage of an order, but it does not change the pack size or the underlying unit price of what you are buying. A discount on a shrunk pack is still a discount on less product than before, so it is worth checking the unit price even when a code makes the total look attractive. Checking current codes for grocery and household shops through a listing such as daily-coupons.info is a separate step from judging whether the pack size and unit price themselves represent good value.
A short routine for regular grocery shopping
Check the unit price rather than only the total price when comparing similar products. Notice when a familiar product's unit price has risen since your last purchase, since this often points to a smaller pack rather than a price increase on an unchanged size. Compare the same product across a couple of shops occasionally, rather than assuming your usual shop is always cheapest. Apply a working code on top of a price and pack size you have already judged to be reasonable, not instead of checking them.
Frequently asked questions
Is shrinkflation illegal?
Reducing a pack size is not illegal on its own. What matters is whether the packaging and pricing information remain accurate and not misleading, and whether required unit pricing is displayed correctly so shoppers can still compare value properly.
Do all online grocery shops have to show a unit price?
Requirements vary by country and, in some cases, by shop size. The EU and UK have unit pricing rules covering most pre-packaged goods, with some exemptions for smaller retailers. In the US, requirements are set at state level rather than nationally, so coverage is less consistent.
Why would a shop shrink a pack instead of just raising the price?
Shoppers tend to notice a price increase on the same size pack more readily than a size reduction at the same price, since the sticker price itself does not change. This is a general observation about how people notice price changes, not a claim about any specific retailer's intentions.
