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In the United Kingdom, the Retail Prices Index or Retail Price Index (RPI) is a measure of
inflation In economics, inflation is an increase in the general price level of goods and services in an economy. When the general price level rises, each unit of currency buys fewer goods and services; consequently, inflation corresponds to a reduct ...
published monthly by the
Office for National Statistics The Office for National Statistics (ONS; cy, Swyddfa Ystadegau Gwladol) is the executive office of the UK Statistics Authority, a non-ministerial department which reports directly to the UK Parliament. Overview The ONS is responsible for ...
. It measures the change in the cost of a
representative sample In statistics, quality assurance, and survey methodology, sampling is the selection of a subset (a statistical sample) of individuals from within a statistical population to estimate characteristics of the whole population. Statisticians attem ...
of
retail Retail is the sale of goods and Service (economics), services to consumers, in contrast to wholesaling, which is sale to business or institutional customers. A retailer purchases goods in large quantities from manufacturing, manufacturers, dire ...
goods In economics, goods are items that satisfy human wants and provide utility, for example, to a consumer making a purchase of a satisfying product. A common distinction is made between goods which are transferable, and services, which are not ...
and services. As the RPI was held not to meet international statistical standards, since 2013 the Office for National Statistics no longer classifies it as a "national statistic", emphasising the
Consumer Price Index A consumer price index (CPI) is a price index, the price of a weighted average market basket of consumer goods and services purchased by households. Changes in measured CPI track changes in prices over time. Overview A CPI is a statisti ...
instead. However, as of 2018 the
UK Treasury His Majesty's Treasury (HM Treasury), occasionally referred to as the Exchequer, or more informally the Treasury, is a department of His Majesty's Government responsible for developing and executing the government's public finance policy and ec ...
still uses the RPI measure of inflation for various index-linked tax rises.


History

RPI was first introduced in 1956, replacing the previous Interim Index of Retail Prices that had been in use since June 1947. It was once the principal official measure of inflation. It has been superseded in that regard by the
Consumer Price Index A consumer price index (CPI) is a price index, the price of a weighted average market basket of consumer goods and services purchased by households. Changes in measured CPI track changes in prices over time. Overview A CPI is a statisti ...
(CPI). The RPI is still used by the government as a base for various purposes, such as the amounts payable on index-linked securities including index-linked gilts, and social housing rent increases. Many employers also use it as a starting point in wage negotiation. Since 2003, it is no longer used by the government for the inflation target for the
Bank of England The Bank of England is the central bank of the United Kingdom and the model on which most modern central banks have been based. Established in 1694 to act as the English Government's banker, and still one of the bankers for the Government o ...
's
Monetary Policy Committee Monetary Policy Committee (MPC) may refer to: * Monetary Policy Committee (India) The Monetary Policy Committee is responsible for fixing the benchmark interest rate in India. The meetings of the Monetary Policy Committee are held at least fo ...
nor, from April 2011, as the basis for the indexation of pensions of former public sector employees. , the UK state pension is indexed by the highest of the increase in average earnings, CPI or 2.5% ("the triple lock"). The highest annual inflation since the introduction of the RPI came in June 1975, with an increase in retail prices of 26.9% from a year earlier. By 1978 this had fallen to less than 10%, but it rose again towards 20% over the following two years before falling again. By 1982, it had fallen below 10% and a year later was down to 4%, remaining low for several years until approaching double figures again by 1990. Aided by a
recession In economics, a recession is a business cycle contraction when there is a general decline in economic activity. Recessions generally occur when there is a widespread drop in spending (an adverse demand shock). This may be triggered by various ...
in the early 1990s, increased interest rates brought inflation down again to an even lower level. From March to October 2009, the change in RPI measured over a 12-month period was negative, indicating an overall annual reduction in prices, for the first time since 1960.Inflation measure turns negative
, BBC News, 21 April 2009
The change in RPI in the 12 months ending in April 2009, at −1.2%, was the lowest since the index started in 1948.
Housing association In Ireland and the United Kingdom, housing associations are private, non-profit making organisations that provide low-cost " social housing" for people in need of a home. Any budget surplus is used to maintain existing housing and to help fi ...
s lobbied the government to allow them to freeze rents at current levels rather than reduce them in line with the RPI, but the
Treasury A treasury is either *A government department related to finance and taxation, a finance ministry. *A place or location where treasure, such as currency or precious items are kept. These can be state or royal property, church treasure or i ...
concluded that rents should follow RPI down as far as −2% per annum, leading to savings in
housing benefit Housing Benefit is a means-tested social security benefit in the United Kingdom that is intended to help meet housing costs for rented accommodation. It is the second biggest item in the Department for Work and Pensions' budget after the state ...
.Landlords lose rent cuts battle
'' Inside Housing'', 10 July 2009
In February 2011, annual RPI inflation jumped to 5.1% putting pressure on the Bank of England to raise interest rates despite disappointing projected GDP growth of only 1.6% in 2011. The September 2011 figure of 5.6%, the highest for 20 years, was described by the ''Daily Telegraph'' as "shockingly bad". After a thorough review, in 2012 the National Statistician's Consumer Prices Advisory Committee (CPAC) determined that due to the use of the Carli formula in certain subcomponents, the RPI is biased upwards compared to other indices by a "formula effect" of roughly one percentage point. CPAC concluded that "the use of the Carli formula is no longer appropriate" due to the weak axiomatic properties of the Carli method. (The weak property is the fact that after a price bounce and a subsequent full return to original prices, the Carli method shows positive aggregate inflation.). In 2013, following a consultation on options for improving the RPI, the National Statistician concluded that the formula used to produce the RPI does not meet international standards and recommended that a new index known as RPIJ be published. Subsequently ONS decided to no longer classify RPI as a "national statistic".RPI no longer an official national statistic – UKSA
John Greenwood, ''MoneyMarketing'', 18 March 2013
However, ONS will continue to calculate RPI, among several versions of the inflation index, in order to provide a consistent historic inflation time series. The index factors continue to be used to adjust for inflation in the calculation of chargeable (capital) gains for inclusion in the tax computation for entities subject to corporation tax in the UK. In January 2018,
Mark Carney Mark Joseph Carney (born March 16, 1965) is a Canadian economist and banker who served as the governor of the Bank of Canada from 2008 to 2013 and the governor of the Bank of England from 2013 to 2020. Since October 2020, he is vice chairman an ...
, Governor of the Bank of England, said that RPI should be abandoned. In November 2021, inflation has risen faster than projected to its highest level in nearly a decade, putting pressure on the Bank of England to increase interest rates. According to data from the ONS, the annual rate of the CPI increased to 4.2 percent in October, up from 3.1 percent in September. Inflation surpassed the Bank of England's target of 2% and was higher than the 3.9 percent predicted by experts. Higher rates for transportation, restaurants, and hotels mainly contributed to the price increase in October.


Calculation

The United Kingdom RPI is constructed as follows: #A base year or starting point is chosen. This becomes the standard against which price changes are measured. #A list of items bought by an average family is drawn up. This is facilitated by the Living Costs and Food Survey. #A set of weights are calculated, showing the relative importance of the items in the average family budget – the greater the share of the average household bill, the greater the weight. #The price of each item is multiplied by the weight given to the item, so that the contribution of the item's price is in proportion to its importance. #The price of each item must be found in both the base year and the year of comparison (or month). This enables the percentage change to be calculated over the desired time period. The RPI calculation employs a variation of the Carli method rather than the Jevons method employed in the calculation of RPIJ and CPI. The unweighted Carli method overstates inflation rates. However as stated above, the RPI calculation employs weights, which remove this overstatement. In practice the comparison is made over shorter periods, and the weights are frequently reassessed. Detailed information is published on the Office for National Statistics website. The RPI includes an element of housing costs, whereas the following items are not included in the CPI:
Council tax Council Tax is a local taxation system used in England, Scotland and Wales. It is a tax on domestic property, which was introduced in 1993 by the Local Government Finance Act 1992, replacing the short-lived Community Charge, which in turn re ...
, mortgage interest payments, house depreciation, buildings insurance, ground rent, solar PV feed in tariffs and other house purchase cost such as estate agents' and conveyancing fees. A further index, CPIH, has been published which includes housing costs but CPIH does not meet current international standards. The Office for National Statistics states that:
The Consumer Prices Index including owner occupiers' housing costs (CPIH) is the most comprehensive measure of inflation. It extends the Consumer Prices Index (CPI) to include a measure of the costs associated with owning, maintaining and living in one's own home, known as owner occupiers'.
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. Regarding state pensions, the UK government confirmed in their autumn statement in 2011 that these would go up by the greater of the CPI, average earnings, or 2.5%. The variability of the change in RPI, due to fluctuations in mortgage interest rates, is shown in the graph on the right. This was one of the arguments used in favour of changing to RPIX.


Variations

Variations on the RPI include the RPIX, which removes the cost of
mortgage A mortgage loan or simply mortgage (), in civil law jurisdicions known also as a hypothec loan, is a loan used either by purchasers of real property to raise funds to buy real estate, or by existing property owners to raise funds for any ...
interest payments, the RPIY, which excludes indirect taxes ( VAT) and local authority taxes as well as mortgage interest payments, and the RPIJ which uses the Jevons (geometric) rather than the Carli (arithmetic) method of averaging.


See also

*
Consumer price index A consumer price index (CPI) is a price index, the price of a weighted average market basket of consumer goods and services purchased by households. Changes in measured CPI track changes in prices over time. Overview A CPI is a statisti ...
(general concept) * Price index (more detailed statistical explanation)


References

{{reflist


External links


Consumer Price Indices: A brief guide
Office for National Statistics, 2013

topic page at ONS website Price indices Economy of the United Kingdom Office for National Statistics 1947 introductions Inflation in the United Kingdom