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The Consumer Price Index as a Measure of Inflation

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  • Michael F. Bryan
  • Stephen G. Cecchetti

Abstract

As inflation approaches zero, it becomes increasingly important to examine the price indices on which monetary policy is based. The most popularly used aggregate price statistic in the U.S. is the Consumer Price Index (CPI), a statistic that appears to be a focal point in monetary policy deliberations. A problem associated with using the CPI, a fixed weight index of the cost-of-living, is that there are likely to be biases in the index as a measure of inflation. In this paper we use a simple statistical framework to compute a price index that is immune to one of the potentially important biases inherent in the CPI as a measure of inflation--weighting bias. Utilizing a dynamic factor model we are able to compute the common inflation element in a broad cross-section of consumer price changes. Our conclusion is that, although there was a large positive weighting bias during the fifteen years beginning in 1967, since 1981 the weighting bias in the CPI as a measure of inflation has been insignificant.

Suggested Citation

  • Michael F. Bryan & Stephen G. Cecchetti, 1993. "The Consumer Price Index as a Measure of Inflation," NBER Working Papers 4505, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:4505
    Note: ME
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    More about this item

    JEL classification:

    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy

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