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...

In this paper, the authors provide a characterization of the set of admissible transformations of utility profiles if it is assumed that the individual utilities are ordinally measurable and interpersonally comparable. Whereas earlier contributions (implicitly) assume that all individual utility...