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Shining a Light on Purchasing Power Parities

Author

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  • Maxim Pinkovskiy
  • Xavier Sala-i-Martin
Abstract
Nighttime lights data are a measure of economic activity whose error is plausibly independent of the measurement errors of most conventional indicators. Therefore, we can use nighttime lights as an independent benchmark to assess existing measures of economic activity (Pinkovskiy and Sala-i-Martin (2016)). We employ this insight to generate three findings in the study of PPP-adjusted estimates of GDP around the world between 1992 and 2010. First, we find that while market exchange rates described poor economies better than did PPP-adjusted estimates in the late 1990s (Dowrick and Akmal 2008; Almas 2012), this pattern has disappeared by the 2010s. Second, we also find that estimates of PPPs have been steadily improving from one price survey round to the next, including during the controversial 2005 and 2011 rounds. Third, we leverage this fact to assess whether it is optimal to measure relative prices as close as possible to the year of interest or to use the latest available relative price data and discard the rest, and provide a theoretical framework in which the latter may be optimal. Using data from the Penn World Tables, we find that, indeed, it is optimal to only use the latest price data, and hence, to revise existing PPP-adjusted estimates whenever a new price survey is released.

Suggested Citation

  • Maxim Pinkovskiy & Xavier Sala-i-Martin, 2018. "Shining a Light on Purchasing Power Parities," NBER Working Papers 24419, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:24419
    Note: DEV EFG IFM
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    References listed on IDEAS

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    Cited by:

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    2. Francová, Olga & Korhonen, Kari & Kovačević, Dušan, 2023. "Quality of life: A way to buttress crisis program evaluations?," Evaluation and Program Planning, Elsevier, vol. 99(C).
    3. Yixia Cai & Timothy Smeeding, 2020. "Deep and Extreme Child Poverty in Rich and Poor Nations: Lessons from Atkinson for the Fight Against Child Poverty," Italian Economic Journal: A Continuation of Rivista Italiana degli Economisti and Giornale degli Economisti, Springer;Società Italiana degli Economisti (Italian Economic Association), vol. 6(1), pages 109-128, March.

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    JEL classification:

    • A1 - General Economics and Teaching - - General Economics
    • E01 - Macroeconomics and Monetary Economics - - General - - - Measurement and Data on National Income and Product Accounts and Wealth; Environmental Accounts
    • F00 - International Economics - - General - - - General

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