Robert Feenstra, Robert Inklaar, Marcel Timmer, 02 September 2013

Why some countries are richer than others is among the most difficult and important questions in economics. Yet, the Penn World Table, widely used to compare living standards across countries, has faced criticism in recent years. This column discusses how the new version of the tables both addresses these criticisms and provides a wider range of tools that will help researchers gain insight into why income differs across countries.

Simon Johnson, Arvind Subramanian, Will Larson, Chris Papageorgiou, 07 December 2009

The Penn World Table is a major data source for many studies of economic growth. This column reveals that its GDP statistics are surprisingly sensitive to revisions – GDP growth for the same country at the same point in time changes across successive versions. Researchers analysing annual data may obtain more robust results by using national accounts data, even though they are not PPP-adjusted.

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