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The Power of Price Indexes
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Raymond Cheung and Mike Waterson
World Economics, March 2011
Price indexes are the most important of all economic indicators simply because they are the tool used to calculate the real size, speed and direction of all forms of economic activity. Price indexes are compiled almost everywhere, but with major differences in method and sampling procedures. Some methods and procedures have led to significant errors. Even in the case of a country as advanced as Japan, critics have calculated that imperfections in method have led to a rate of price inflation around 1.8% per year above the level a true cost of living index would have shown. Further research undertaken by World Economics has attempted to make estimates for changes in discounting and promotional practices at the retail level. The conclusion is that, in reality, the overestimation of price changes by the Japanese CPI in recent years may well have been in excess of 2% per annum, and could have been significantly more. Different CPI assumptions change economic growth estimates dramatically. Using World Economics estimates, adding in a minimum figure for marketing and retail changes seen in recent years suggests, contrary to official data, that Japanese consumption growth exceeded that of the US.
International Comparisons of GDP
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Elio Lancieri, World Economics, September 2008
The recent publication by the World Bank of PPP-GDP estimates for 2005, referred to 146 countries, seems a good occasion to reopen the long-standing debate on the use of Purchasing Power Parities. While theoretical speculations on the subject have continued, no estimates were supplied for more than a decade. The author’s alternative method for GDP estimation is based on inflationadjusted long-term exchange rates, where real GDP estimates are obtained through simultaneous equations. He describes the method in the light of his experience and compares its results for 100 countries with both ICP estimates and GDPs at exchange rates.
What a Consumer Price Index Can’t Do
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Ralph Turvey, World Economics, September 2004
A monthly consumer price index traces changes in the monthly cost of a year’s consumption using a sample of prices. But in some months the prices that can be sampled will temporarily exclude some of the products that were bought in the base year, Christmas trees providing a textbook example. Worse still, it becomes permanently impossible to observe prices for sampled products that have been completely superseded. There are methods for dealing with these two problems, but they leave serious and irremediable defects in the index.
Some Proposed Methodological Developments for the UK Retail Prices Index
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Mick Silver, World Economics, March 2003
The Retail Prices Index (RPI) is one of the UK’s most important macroeconomic indicators, as well as being used for indexation/adjustments for inflation to wages and benefits. This paper argues that the dynamic changes in product markets and consumers’ responses to price changes need to be incorporated into the RPI if it is to effectively measure changes in the cost of living. The quite positive and innovative work undertaken by the Office for National Statistics (ONS) is acknowledged. However, the basis of the RPI, in measuring the price changes of a matched, fixed basket of goods, is considered inappropriate to modern markets. Some proposals are made.
Owner-occupiers and the Price Index
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Ralph Turvey, World Economics, September 2000
The treatment of owner-occupied dwellings in Consumer Price Indexes varies between countries and is the subject of continuing controversy. Ralph Turvey explains the alternative possible treatments and reasons for disagreement.


From Big Macs to iMacs
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Jonathan Haskel & Holger Wolf, World Economics, June 2000
The authors review recent international price comparisons to examine the veracity of claims about “rip-off Britain”. They reach three conclusions. First, methodologically, the data requirements for a meaningful price comparison are very demanding and most of the evidence does not meet these standards. Second, price differences within countries seem, in many cases, to be just as high if not higher than price differences between countries. Third, for most goods, the difference between the UK and the rest of the EU seems to be minor relative to the difference between the EU and the United States. The real puzzle is the comparatively high prices in the EU.

Displaying: 1-6 of 6