I examine the once popular claim according to which interpersonal comparisons of welfare are necessary for social choice. side with current choice theorists in emphasizing that, on a narrow construal, this necessity is refuted beyond appeal. However, depart from opinion presently prevailing theory highlighting that broader proves not only compatible with, but even comforted by, state field. sub...

Collective decisions in animal groups emerge from the actions of individuals who are unlikely to have global information. Comparative assessment of options can be valuable in decision-making. Ant colonies are excellent collective decision-makers, for example when selecting a new nest-site. Here, we test the dependency of this cooperative process on comparisons conducted by individual ants. We p...