What is the difference between the barometers of inflation, the RPI and CPI?
At the moment, CPI says inflation is 4%, RPI says it is 5.3% and that has given the government the opportunity to save money.
The BBC's Stephanie Flanders explains the merits of the two measures.
And the First Division Association's Jonathan Baume discusses how the government's use the CPI may affect the public sector.
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