This material has been published in Journal of Economic Theory 49, 113-134, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by Academic Press. This material may not be copied or reposted without explicit permission. (Copyright (C)1989 by Academic Press, Inc.). Academic Press publishes electronically in IDEAL (International Digital Electronic Access Library) at http://www.idealibrary.com and http://www.europe.idealibrary.com.
Journal of Economic Theory, 1989, vol. 49, no. 2, pp. 113-134
Peter J Hammond (Stanford University)
Mamoru Kaneko (Virginia Polytechnic Institute)
Myrna Holtz Wooders (University of Toronto)