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How to measure living standards and productivity

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  • Oulton, Nicholas

Abstract

This paper sets out a general algorithm for calculating true cost-of-living indices or true producer price indices when demand is not homothetic, i.e. when not all expenditure elasticities are equal to one. In principle, economic theory tells us how we should calculate a true cost-of-living index or Konüs price index: first estimate the consumer's expenditure function (cost function) econometrically and then calculate the Konüs price index directly from that. Unfortunately this is impossible in practice since real life consumer (producer) price indices contain hundreds of components, which means that there are many more parameters than observations. Index number theory has solved this problem, at least when demand is homothetic (all income elasticities equal to one). Superlative index numbers are second order approximations to any acceptable expenditure (cost) function. These index numbers require data only on prices and quantities over the time period or cross section under study. Unfortunately, there is overwhelming evidence that consumer demand is not homothetic (Engel's Law). The purpose of the present paper is to set out a general algorithm for the nonhomothetic case. The solution is to construct a chain index number using compensated, not actual, expenditure shares as weights. The compensated shares are the actual shares, adjusted for changes in real income. These adjustments are made via an econometric model, where only the responses of demand to income changes need to be estimated, not the responses to price changes. This makes the algorithm perfectly feasible in practice.

Suggested Citation

  • Oulton, Nicholas, 2009. "How to measure living standards and productivity," LSE Research Online Documents on Economics 28678, London School of Economics and Political Science, LSE Library.
  • Handle: RePEc:ehl:lserod:28678
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    7. Cooper, Russel J. & McLaren, Keith R. & Rehman, Fahd & Szewczyk, Wojciech A., 2015. "Economic welfare evaluation in an era of rapid technological change," Economics Letters, Elsevier, vol. 131(C), pages 38-40.
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    10. Ranjan Ray, 2017. "The Role of Prices in Welfare Comparisons: Methodological Developments and a Selective Survey of the Empirical Literature," The Economic Record, The Economic Society of Australia, vol. 93(301), pages 314-332, June.

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    More about this item

    Keywords

    consumer price index; Konüs; cost of living; measurement of welfare change; Quadratic Almost Ideal Demand System; producer price index; homothetic; productivity;
    All these keywords.

    JEL classification:

    • C43 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: Special Topics - - - Index Numbers and Aggregation
    • D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
    • O47 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Empirical Studies of Economic Growth; Aggregate Productivity; Cross-Country Output Convergence
    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
    • D24 - Microeconomics - - Production and Organizations - - - Production; Cost; Capital; Capital, Total Factor, and Multifactor Productivity; Capacity
    • D11 - Microeconomics - - Household Behavior - - - Consumer Economics: Theory
    • I31 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - General Welfare, Well-Being

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