Why Elementary Price Index Number Formulas Differ: Price Dispersion and Product Heterogeneity

July 1, 2006

Preview Citation

Format: Chicago

Mick Silver, and Saeed Heravi. Why Elementary Price Index Number Formulas Differ: Price Dispersion and Product Heterogeneity, (USA: International Monetary Fund, 2006) accessed September 26, 2024

Disclaimer: This Working Paper should not be reported as representing the views of the IMF.The views expressed in this Working Paper are those of the author(s) and do not necessarily represent those of the IMF or IMF policy. Working Papers describe research in progress by the author(s) and are published to elicit comments and to further debate

Summary

The Consumer Price Index Manual (2004) provides guidelines for aggregation formulas that are promulgated at IMF training courses and technical assistance missions. This paper develops elementary level aggregation theory to better inform users and compilers. Most countries use either the Dutot or Jevons index formula. These formulas generally give different results; advice on choice of formula matters. Using an approach based on sample estimators, and an illustration based on scanner data, the paper shows how differences in these formulas can be explained by changes in price dispersion and, in turn, by product heterogeneity. Implications for choice of formula are considered.

Subject: Consumer price indexes, Expenditure, Labor, Population and demographics, Price indexes

Keywords: Base period, WP

Publication Details

Pages:

18
Volume:

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DOI:

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Issue:

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Series:

Working Paper No. 2006/174
Stock No:

WPIEA2006174
ISBN:

9781451864342
ISSN:

1018-5941

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