CPI vs RPI — which is best for uprating benefits?

The Government announced that it was to shift from the RPI to the CPI for uprating benefits. There are pros and cons with the proposal, but on the basis of recent years' data, the shift would lead to lower average rates, namely smaller increases in government spending.

The Royal Statistical Society wrote to the UKSA raising concerns :
http://www.statisticsauthority.gov.uk/reports---correspondence/correspondence/letter-from-david-hand-to-sir-michael-scholar-25082010.pdf

Sir Michael Scholar replied in October 2010:
http://www.statisticsauthority.gov.uk/reports---correspondence/correspondence/letter-from-sir-michael-scholar-to-the-president-of-the-royal-statistical-society-061210.pdf

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