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Consistent GDP Aggregation and Purchasing Power Parity

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  • Dumagan, Jesus C.

Abstract

Consistent aggregation ensures that real GDP level and growth do not change as the existing GDP components are merely rearranged. Otherwise, level or growth changes are spurious. This paper proposes a framework for consistent aggregation where components are converted to "purchasing power parity" (PPP) values that "add up exactly" to the same real GDP regardless of the grouping of components. This PPP framework applies to GDP either in constant prices or in chained prices. PPP is applied to US GDP in chained prices based on the Fisher index to (i) reduce US nonadditivity residuals to zero; (ii) correct misleading contributions to GDP growth computed by the US Bureau of Economic Analysis; and (iii) show that GDP quantity indexes in PPP are consistent in aggregation although the Fisher formula is inconsistent. Moreover, PPP implications on GDP measurement for some areas of economic research (e.g., income inequality and poverty incidence) are discussed.

Suggested Citation

  • Dumagan, Jesus C., 2012. "Consistent GDP Aggregation and Purchasing Power Parity," Discussion Papers DP 2012-02, Philippine Institute for Development Studies.
    • Handle: RePEc:phd:dpaper:dp_2012-02
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    References listed on IDEAS

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    1. Jianmin Tang & Weimin Wang, 2004. "Sources of aggregate labour productivity growth in Canada and the United States," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 37(2), pages 421-444, May.
    2. Diewert, W Erwin, 1978. "Superlative Index Numbers and Consistency in Aggregation," Econometrica, Econometric Society, vol. 46(4), pages 883-900, July.
    3. Dumagan, Jesus C., 2011. "Deriving Weights for Additivity of Chained Volume Measures in the National Accounts," Discussion Papers DP 2011-08, Philippine Institute for Development Studies.
    4. Dumagan, Jesus C., 2011. "Implementing Weights for Additivity of Chained Volume Measures in the National Accounts," Discussion Papers DP 2011-09, Philippine Institute for Development Studies.
    5. Jesus C. Dumagan, 2013. "A Generalized Exactly Additive Decomposition of Aggregate Labor Productivity Growth," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 59(1), pages 157-168, March.
    6. Dumagan, Jesus C., 2002. "Comparing the superlative Tornqvist and Fisher ideal indexes," Economics Letters, Elsevier, vol. 76(2), pages 251-258, July.
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