MEASURING UK INFLATION Presentation to Civil Service Pensioners
- Slides: 16
MEASURING UK INFLATION Presentation to Civil Service Pensioners’ Alliance conference on price indexation November 23 rd 2010 Jill Leyland Vice President, Royal Statistical Society
Key points • Compiling price indices difficult and controversial • UK Consumer Price Index does not have appropriate coverage for inflation uplift measure but • Retail Price Index methodology looks questionable; probably overstates inflation • What needs to be done
Measuring inflation often controversial – in any country • People have different spending patterns – so different inflation experiences • Notice price rises more than price falls • Conceptual problems • Methodological issues – no single “right” way of compiling index numbers and – different approaches give different results
Conceptual problems • • Owner-occupied housing Taxation Quality changes Movement in prices vs “cost of living”
Constructing an index 1) Decide: – what items to include and their weight in the overall basket – base period (set as 100) 2) For each item: – collect prices from different outlets every month – calculate “average” % increase (or decrease) between base period and current month (calculation step 1) 3) Calculate weighted “average” percentage increase (decrease) for ALL items – (calculation step 2) But. . .
How to calculate the “average”? Many methods – choice a matter of judgement. Most common for indices: – Arithmetic mean (two variations): add up the n items and divide by n – Geometric mean: Multiply the n items together and take nth root of the result Key point: assumption about degree to which people switch to lower priced items
In the UK • Two different indices: • Consumer price index – originally called the Harmonised Index of Consumer Prices (HICP) • Retail price index – long standing and familiar
Consumer price index • Harmonised index to measure inflation in EU countries on comparable basis • Owner occupied housing left out; no agreement on treatment • Based on economic concepts… – Council tax, vehicle excise duty, TV licences, trade union dues left out – Low weight for insurance – Spending by overseas visitors included • Geometric mean at calculation step 1
UK unusual name change • Originally called Harmonised Index of Consumer Prices (HICP) • Name changed in UK in 2003 when made inflation target • UK unusual in doing this. Other countries call it HICP and use CPI for their main index
CPI • Fine for macroeconomic purposes (eg inflation targeting, international comparisons) • But coverage not suitable for other uses including wage negotiations, pensions/benefits uplift etc • Geometric mean at step 1 assumes some degree of switching to lower priced items
RPI • Covers most items in household budget inc mortgage payments; excludes some households • Uses arithmetic mean at step 1. – Assumes no switching to cheaper versions of same item – And for many items a form of arithmetic mean which tends to show higher inflation • Therefore probably overstates inflation Major changes to formula difficult due to index linked bond issue
Differences: it’s not just housing • Treatment of owner occupier housing one difference but also others • Exclusion of other items from CPI, certain households from RPI • And the “formula effect” – impact of use of different means in calculation step 1 • Formula effect difference very important and always in the same direction so RPI will grow faster than CPI
And the difference is: Reduction in interest rates during crisis
But adjusting formula effect NB: rough and ready adjustment
What needs to be done • ONS must pay attention to all uses of price indices not just macroeconomic ones • In short term “CPI plus” should be created with coverage adjustments; different indices for different household groups • In longer term proper assessment of extent to which consumers switch to lower priced items; appropriate index treatment for different items selected • Where possible improvements made to RPI methodology
Users must make their voice heard • Directly: ONS very willing to listen, about to carry out consultation on CPI/RPI but • Don’t always hear from users outside central government And also Statistics User Forum: – organisation for users (auspices of RSS, supported by ESRC and UK Statistics Authority) – developing full user engagement website – Interim site at http: //sufenews. org. uk/ or email suf@rss. org. uk
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