In April 2013, Istat started the release of a new set of indicators with the aim of providing a measure of the effects of the inflation on five different population subgroups, defined according to the consumption expenditure level of the households.
The five subgroups have been identified sorting households on the basis of the amount of equivalent expenditure (that is calculated taking into account the size of each household) and then dividing them in 5 subgroups of the same size so that in the first group there are the households with the lowest level of expenditure and in the last group those ones with the highest level of expenditure. For each of the previous groups, different weighting schemes were estimated.
The indices of five subgroups share the set of basic information (basket of products and price elementary data) and the methodology of Italian Hicp but they differ with one another for the system of weights used for their calculation.
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