Retrospective Price Indices and Substitution Bias
AbstractThe consumer price index (CPI) is usually computed as a fixed-weighted Laspeyres price index, with the weights updated at discrete intervals only. It is well known that the Laspeyres functional form entails a substitution bias. One way to reduce it would be to use chained indices, and superlative ones if possible. Unfortunately, the necessary data are often missing. This paper proposes a simple method to retroactively compute the CPI once updated weights become available. The proposed index has the Fisher form. This makes it possible to assess the size of the substitution bias. An application to Swiss data is provided.
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Bibliographic InfoPaper provided by UBC Department of Economics in its series UBC Departmental Archives with number erwin_diewert-2009-4.
Length: 11 pages
Date of creation: 20 Jan 2009
Date of revision: 20 Jan 2009
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price index; inflation; superlative indices; substitution bias;
Other versions of this item:
- C43 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Index Numbers and Aggregation
- E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
This paper has been announced in the following NEP Reports:
- NEP-ALL-2009-01-31 (All new papers)
- NEP-CBA-2009-01-31 (Central Banking)
- NEP-MAC-2009-01-31 (Macroeconomics)
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