Every month, for each category, we measure how the cost of making it changed over the last 3 months and put it next to the change in general prices over the same months.
The cost increase of the last 3 months for fabric, foam, wood panels (chipboard and MDF), metal, labour (the minimum wage) and the exchange rate, from TurkStat domestic producer prices, Central Bank exchange rates and the Ministry of Labour and Social Security. Each category weights these by its cost structure (for example, fabric and foam weigh most in sofa sets). Since the A-2026.11 method version the cost index is chained monthly: each month's change uses the items' fixed weights.
We do not forecast prices. We tested a forecasting indicator on past years against actual prices and it did not beat a simple rule, so this site shows measured changes only. Each month's figures are stored and never changed afterwards; a correction is dated and shown on the page. How we test →
We cannot say what one product will cost on a given day. Store promotions, stock and price list changes are not visible from outside. The cost weights are starting assumptions.
Method version: A-2026.11
A method change applies from the issue named; figures already published stay as they were. Corrections are dated. From the January 2027 issue, the weights of the cost components change only in the January, April, July and October issues; every change is listed here with the issue it starts in.
From the November 2026 issue (planned, decided on October 21, 2026): January minimum-wage term removed. A minimum-wage rise also lifts general inflation, and experiment E28 found no reliable effect of it on the gap between category prices and general inflation.
From the October 2026 issue: Chained cost index. The cost index is chained month by month: each month's change is weighted with the fixed component weights. Before, components that had risen fast since 2018 gained weight by themselves.
From the October 2026 issue: Measured data only. Pages show the cost change of the last 3 months next to general prices, without forecast colours or numbers about the future. In our tests on past years, the coloured indicator did not beat a simple rule.
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