Journal Article The Penn World Table (Mark 5): An Expanded Set of International Comparisons, 1950–1988 Get access Robert Summers, Robert Summers University of Pennsylvania Search for other works by this author on: Oxford Academic Google Scholar Alan Heston Alan Heston University of Pennsylvania Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 106, Issue 2, May 1991, Pages 327–368, https://doi.org/10.2307/2937941 Published: 01 May 1991