Economists wish to compare prices, real income, and output across countries and regions for many purposes. In the past, such comparisons were made in nominal terms, or by using exchange rates across countries, ignoring differences in price levels and thus distorting the results. Great progress...

In this paper we propose a new approach to international comparisons of real GDP measured from the output-side. The traditional Geary-Khamis system to measure real GDP from the expenditure-side is modified to include differences in the terms of trade between countries. It is shown that this...