Abstract. A necessary and sufficient condition for linear aggregation of SSB utility functionals is presented. Harsanyi’s social aggregation theorem for von Neumann-Morgenstern utility functions is shown to be a corollary to this result. Two generalizations of Fishburn and Gehrlein’s conditional linear aggregation theorem for SSB utility functionals are also established. Journal of Economic Literature classification numbers: D71, D81. Keywords. Harsanyi’s theorem, social choice, preference aggregation, nonexpected utility, SSB utility
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