We study social welfare relations (SWRs) on infinite utility streams. Our main result is a new characterization of a utilitarian SWR on lotteries over welfare distributions for an infinite population. We characterize this SWR as the maximally complete SWR over lotteries on such distributions which satisfies Strong Pareto, Permutation Invariance (elsewhere called "Relative Anonymity" and "Isomorphism Invariance"), Dominance, Ex Ante Indifference, and an Additive Invariance axiom.
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Goodman et al. (2024) studied this question.