information, in particular the measurability and comparability properties of individual evaluation functions. Social welfare … functionals are defined formally together with closely related concepts. After adducing a good number of examples, we elaborate on …

September 1999 <p> Roberts' "weak neutrality" or "weak welfarism" theorem concerns Sen social welfare functionals which …> Keywords: social welfare functionals, weak welfarism. …

: social welfare functionals, Arrow's theorem, Wilson's theorem, welfarism, neutrality, restricted domains, economic domains … the strong and weak ``welfarism'' results due to d'Aspremont and Gevers and to Roberts. Hence, for social welfare … functionals with or without interpersonal comparisons of utility, most previous classification results in social choice theory …