The Penn World Table displays a set of national accounts economic time series covering many countries. Its expenditure entries are denominated in a common set of prices in a common currency so that real quantity comparisons can be made, both between countries and over time. It also provides...

A new interest in the role of services in world transactions has been generated by the current efforts of the U. S. Government to reduce barriers to international trade in services.The paper distinguishes four different classifications of economic activities between services and corrmodities....