Hicks' Aggregation Theorem and the Existence of a Real Value-Added Function* *This work was partially supported by the National Science Foundation Grant GS-2874-Al at the Institute for Mathematical Studies in the Social Sciences, Stanford University, and by a Canada Council Grant S. I am indebted to E.R. Berndt, C. Blackorby, L, Epstein, D. McFadden and A.D. Woodland for helpful discussions. This paper is a revised version of IMSSS Technical Report 84, January 1973.
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