Information Invariance in Variable-Population Social-Choice Problems
We examine the possibilities of extending Sen's taxonomy of fixed- population information assumptions regarding the measurability and interpersonal comparability of individual utilities to social-choice problems where the population may vary. It is shown that in order to avoid impossibility results, more restrictive assumptions than in the fixed-population framework are required. We provide characterizations of variable-population social-welfare orderings based on information assumptions, and we suggest a way of generating the required informational environment by means of norms which impose a domain restriction on the set of possible utility
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