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Estimating real production and expenditures across nations : a proposal for improving the Penn World Tables, Volume 1
Author:Feenstra, Robert C.; Heston, Alan; Timmer, Marcel P.; Deng, Haiyan; Country:World;
Date Stored:2007/03/12Document Date:2007/03/01
Document Type:Policy Research Working PaperSubTopics:Economic Theory & Research; Markets and Market Access; Free Trade; Trade Policy; Access to Markets
Language:EnglishRegion:The World Region
Report Number:WPS4166Collection Title:Policy, Research working paper ; no. WPS 4166
Volume No:1  

Summary: From its inception, the Penn World Tables (PWT), building on the International Comparisons Program (ICP) of the United Nations, has sought to compare the standard of living of individuals in different countries. That is, the term "real GDP per capita" as reported in the PWT is intended to represent the ability to purchase goods and services by a representative agent in the economy. The same is true of benchmark comparisons as published by the United Nations, Eurostat, or OECD. But this expenditure-side interpretation of real GDP is quite different from the uses to which benchmark ICP and PWT data are frequently applied, such as in growth regressions, where "real GDP" is intended to reflect the production side of the economy. In this paper the authors propose a new approach to international comparisons of real GDP measured from the output side. They modify the traditional Gary-Khamis system, which measures real GDP from the expenditure side using real domestic expenditure, to include differences in the terms of trade between countries. The analysis shows that this system has a strictly positive solution under mild assumptions. On the basis of a set of domestic final output, import, and export prices and values for 151 countries in 1996, differences between real GDP measured from the expenditure and output side can be substantial, especially for small open economies.

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