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The main measure of inflation in the UK is the retail price index (RPI). One way to think of the RPI is as a measure of the changing cost of buying a very large shopping basket containing all of the purchases of a typical UK household. There is, of course, no such thing as a typical household. As a result, inflation varies across the household population, and it would be remarkable if the RPI were a good measure of inflation for every household. This IFS commentary explores the issues surrounding the extent and the implications of differences in inflation rates between households.