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Based on Cowles Commission Discussion Paper, Economics, No. 2067 (January, 1953). This article has been prepared under contract Nonr-358(01), NR 047-006 between the Office of Naval Research and the Cowles Commission for Research in Economics.
I am grateful to E. Malinvaud, staff members and guests of the Cowles Commission, in particular I. N. Herstein, L. Hurwicz, T. C. Koopmans, and R. Radner for their comments.