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 very.

This paper analyses a two-period foreign-aid model where assistance can be given in the form of consumption or population control aid.

This paper shows that, in a partially welfarist framework that permits discounting, per-period social evaluations can be consistent with a timeless social ordering only if social principles lead to the repugnant conclusion. The same result applies if per-period social evaluations are replaced by...

This paper provides a survey of normative approaches to inequality measurement, to be published as a chapter in a volume of income inequality. We present general methods for deriving ethical inequality indexes from social-evaluation orderings such as the Atkinson-Kolm-Sen and Kolm procedures.