Journal Article Classical Theory, Graham's Theory, and Linear Programming in International Trade: Comment Get access Jochen Schumann, Jochen Schumann University of Frankfurt/Main Search for other works by this author on: Oxford Academic Google Scholar Horst Todt Horst Todt University of Frankfurt/Main Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 71, Issue 3, August 1957, Pages 464–469, https://doi.org/10.2307/1884669 Published: 01 August 1957