Shrinkflation is a price rise that never announces itself: the quantity drops, the price tag does not move. Per kilo, you pay more. Here is how it works, what the law requires, and what Aukilo keeps visible over time.
Cutting the quantity sold while keeping the displayed price raises the price per kilo without touching the number you read on the shelf. The pack often keeps its size, its colour and its place in the aisle. Only the weight, printed small, changes.
In France, since 1 July 2024, shops larger than 400 m² must flag a drop in quantity at an unchanged price, with a notice next to the product. The obligation lasts only two months, spares smaller shops, and ignores stretchflation, where the pack grows but costs more per kilo.
Every price entry records the weight alongside the price. When a product changes format, the gap shows up in its history and the product is flagged, well beyond the two months of mandatory display. That memory is built by contributors, shop after shop.
Aukilo compares the price per kilo, per litre and per unit across thousands of products, format by format and retailer by retailer.