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The laspeyres bias in the Spanish consumer price index

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  • Javier Ruiz Castillo
  • Eduardo Ley
  • Mario Izquierdo

Abstract

The CPI compares the cost of acquiring a reference quantity vector at current and base prices. Such reference vector is the vector of mean quantities actually bought by a reference population, whose consumption patterns are investigated during a period t prior to the index base period 0. In this paper we show that unless one takes into account the price index of the Laspeyres types. Among several negative consequences, the most important is that this omission produces a bias in the measurement of inflation which we call the "Laspeyres bias". Using Spanish data, we estimate that, e.g. from 1992 to 1998, the size of the Laspeyres bias is -0.061 per cent per year, or about 6 per cent (in absolute terms) of the positive bias estimated by the Boskin commission for the U.s., which is equal to 1.1 per cent per year. The Laspeyres bias in shorter time periods reached -0.122, and -0.108 per cent per year in 1992, and 1997, respectively.

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Paper provided by FEDEA in its series Working Papers with number 2000-05.

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Handle: RePEc:fda:fdaddt:2000-05

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Cited by:
  1. Okidi, John A. & Nsubuga, Vincent, 2010. "Inflation Differentials Among Ugandan Households: 1997 - 2007," Research Series 150482, Economic Policy Research Centre (EPRC).
  2. Javier Ruiz Castillo & Eduardo Ley & Mario Izquierdo, . "Distributional aspects of the quality change bias in the CPI: Evidence from Spain," Working Papers 2000-08, FEDEA.
  3. Okidi, John A. & Nsubuga, Vincent, 2010. "Inflation differentials among Ugandan household: 1997 - 2007," Research Reports 102497, Economic Policy Research Centre (EPRC).

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