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RPI/CPI User Group

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To foster cooperation and the exchange of information between ONS statisticians concerned with the RPI and CPI, the Consumer Prices Advisory Committee (CPAC) and those using the data. Please see 'Aims of the RPI/CPI User Group' in the library for further details.

Consumer Price Indices and the Identification Problem

Aug 22, 2013 2:17 PM

I attach a copy of the published update of my paper dealing with the need to take account of the causes of price changes when constructing elementary aggregates for consumer price indices. The conclusion is that for most items we are unable to solve the identification problem of whether supply-side or demand-side influences predominate: in these circumstances, the appropriate formula to use for first-stage aggregation is one that makes no assumptions about the cause of price changes – i.e. one that uses an arithmetic rather than a geometric average.


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