Early test version. The cost and inflation figures are real official statistics. This page shows measured changes only; the weights that combine the cost series into a category are our own estimates.
We do not tell you what to buy and we do not forecast prices. We show what was measured: how much the cost of making each product group has changed over the last 3 months, next to general prices.
Let's read one row together
Mattresses The measured rise in this category's production costs over the last 3 months: a weighted average of official price series (materials, labour, and import prices or the exchange rate), using cost shares we assume. It is the maker's cost, not a shelf price; shop prices are measured and shown separately. How to read →+0.8%
Inflation The rise in general consumer prices over the same 3 months. A category's costs may have risen faster or slower; this shows the past only. How to read →general prices+1.0%
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Cost shows the makers' computed expense; inflation is the change in general prices over the same months.
For Mattresses, input costs over the 3 months to August 2026 changed by 0.8%. The bar shows this number.
The black bar below it is the change in general prices over the same 3 months: 1.0%.
A cost bar longer than the black bar means costs moved more than general prices; a shorter bar means less. Both describe the past.
Where a grey “Shop prices (official)” bar is shown, it is what the official consumer price index recorded in shops over the same months. It is measured separately from the cost; we draw no cause-and-effect link between the two.
Open the category to see which costs the change is made of.
Cost change
The measured change in what it costs to make a product group over the 3 months to August 2026. It is a weighted average of official price series for materials, labour, and import prices or the exchange rate, using cost shares we assume.
It is the maker's cost, not a shelf price, so it says nothing about what one product costs on a given day.
Why we show general prices
When general prices are rising, almost everything gets more expensive. The black bar lets you see whether a product group's costs moved more or less than prices in general over the same months.
It is the measured change in consumer prices, not an expectation.
Category page: where the cost change comes from
Open a category to see the parts of the cost change. Each item is written in points, and the points add up to the cost change. For example, “Textiles +3.2” means that item adds 3.2 points to the total; it does not mean it became 3.2% more expensive.
Cost index
The line is the weighted cost of making that product group; the first month is set to 100. If you see 120, costs have risen 20% since then. It is not the shelf price.
Three common misreadings
“A 0.8% price rise is coming.” No: this is a cost change that already happened, not a forecast.
“Prices at the store I look at moved just as much.” No: it is a category average and the cost of making, not the price at any store.
“A short bar means prices will fall.” No: it means costs moved less than general prices in these months.
What we cannot know
We cannot know what a single product will cost on a given day, stores' promotion calendars or the days they update price lists. Nothing here is a price forecast or financial advice.