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A CPI is a statistical estimate constructed using the prices of a sample of representative items whose prices are collected periodically. Sub-indices and sub-sub-indices can be computed for different categories and sub-categories of goods and services, which are combined to produce the overall index with weights reflecting their shares in the total of the consumer expenditures covered by the ...
Price-cap regulation is sometimes called "CPI - X", (in the United Kingdom "RPI-X") after the basic formula employed to set price caps. This takes the rate of inflation, measured by the Consumer Price Index (UK Retail Prices Index, RPI) and subtracts expected efficiency savings .
[The formula does not make clear over what the summation is done. P C = 1 n ⋅ ∑ p t p 0 {\displaystyle P_{C}={\frac {1}{n}}\cdot \sum {\frac {p_{t}}{p_{0}}}} On 17 August 2012 the BBC Radio 4 program More or Less [ 3 ] noted that the Carli index, used in part in the British retail price index , has a built-in bias towards recording ...
This formula determines the overall inflation rate, which is the percentage change in the CPI over a given time period. In January 2024, the CPI increased 3.1 percent over the previous 12 months ...
CPI is usually lower, though this is due more to the differences in the calculation formulas for the indices than to the differences in coverage. The UK Government announced in the June 2010 budget that CPI would be used in place of RPI for uprating of some benefits with effect from April 2011. [24]
Prior to December's print, core CPI had been stuck at a 3.3% annual gain for the past four months. It was the first time since July that year-over-year core CPI saw a deceleration in price growth.
The latest available data is from June this year and shows inflation was 2.0%.
There has been criticism of CPI as being a less effective measure of price rises than the Retail Prices Index, accusing it of being easier to manipulate and less broad based (for example excluding housing). John Redwood, the Conservative MP, has said that CPI targeting meant that interest rates were set lower at a time of rising (RPI) inflation ...