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The Laspeyres bias in the Spanish consumer price index

Author

Listed:
  • 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 τ prior to the index base period 0. This paper shows that unless the price change between these two dates is taken into account, the CPI ceases to be a proper statistical price index of the Laspeyres type. Among several negative consequences, the most important is that this omission produces a bias in the measurement of inflation: the 'Laspeyres bias'. Using Spanish data, the size of the Laspeyres bias is estimated at -0.061% per year, during 1992-1998. The Laspeyres bias in shorter time periods reached -0.122% per year in 1992, and -0.108 in 1997.
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Suggested Citation

  • Javier Ruiz-Castillo & Eduardo Ley & Mario Izquierdo, "undated". "The Laspeyres bias in the Spanish consumer price index," Studies on the Spanish Economy 72, FEDEA.
    • Handle: RePEc:fda:fdaeee:72
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    Cited by:

    1. Jacek Białek & Elżbieta Roszko-Wójtowicz, 2021. "Dynamics of price level changes in the Visegrad group: comparative study," Quality & Quantity: International Journal of Methodology, Springer, vol. 55(1), pages 357-384, February.
    2. Okidi, John A. & Nsubuga, Vincent, 2010. "Inflation differentials among Ugandan household: 1997 - 2007," Research Reports 102497, Economic Policy Research Centre (EPRC).
    3. Mark A. Wynne & Diego Rodriguez‐Palenzuela, 2004. "Measurement Bias in the HICP: What do we know and What do we need to know?," Journal of Economic Surveys, Wiley Blackwell, vol. 18(1), pages 79-112, February.
    4. Ruiz-Castillo, Javier & Ley, Eduardo & Izquierdo, Mario, 2002. "Distributional aspects of the quality change bias in the CPI: evidence from Spain," Economics Letters, Elsevier, vol. 76(1), pages 137-144, June.
    5. Okidi, John A. & Nsubuga, Vincent, 2010. "Inflation Differentials Among Ugandan Households: 1997 - 2007," Research Series 150482, Economic Policy Research Centre (EPRC).
    6. Shaikh Hamid & Tej Dhakar, 2008. "The behaviour of the US consumer price index 1913-2003: a study of seasonality in the monthly US CPI," Applied Economics, Taylor & Francis Journals, vol. 40(13), pages 1637-1650.
    7. Agnieszka Leszczynska & Aleksandra Halka, 2012. "What does the Consumer Price Index Measure? Bias Estimates for Poland," EcoMod2012 4370, EcoMod.

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