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Understanding PPPs and PPP-based national accounts

  • Angus Deaton

    (Princeton University)

  • Alan Heston

    (University of Pennsylvania)

PPP-based national accounts have become an important part of the database for macroeconomists, development economists, and economic historians. Frequently used global data come from the Penn World Table (PWT) and the World Bank’s World Development Indicators; a substantial fraction of the world is also covered in the PPP accounts produced by the OECD and the European Union. This paper provides an overview of how these data are constructed, and discusses both the theory and the practical problems of implementing it. All of these data are underpinned by the International Comparison Program (ICP), which collects data on prices worldwide. The most recent round of the ICP was for 2005 with final results published in early 2008; version 7.0 of the Penn World Table will soon incorporate these results. The 2005 ICP, like earlier rounds, involved substantial revisions to previous data, most notably revising downwards the size of the Chinese (40 percent smaller) and Indian (36 percent) economies. We discuss the reasons for the revisions, and assess their plausibility. We focus on four important areas: how to handle international differences in quality, the treatment of urban and rural areas of large countries such as China, India, and Brazil, how to estimate prices for government services, health, and education, and the effects of the regional structure of the ICP. All of these affect the interpretation of previous data, as well as the current revisions. We discuss previous revisions of the PWT, and their effects on various kinds of econometric analysis. The paper concludes with health warnings that should be kept in mind when using these data, which are not always suitable for the purposes to which they are put. Some international comparisons are close to impossible, even in theory, and in others, the practical difficulties make comparison exceedingly hazardous.

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Paper provided by Princeton University, Woodrow Wilson School of Public and International Affairs, Research Program in Development Studies. in its series Working Papers with number 1186.

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Date of creation: Nov 2009
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Handle: RePEc:pri:rpdevs:deaton_heston_complete_nov10
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