Social choice

Abstract

Social choice theory provides a formal framework for aggregating individual welfare, judgments, or interests into collective social measures. The field centers on the structural limitations of this aggregation, most notably the proof that no social welfare function can simultaneously satisfy conditions of unrestricted domain, independence of irrelevant alternatives, the Pareto principle, and non-dictatorship. This foundational result necessitates a critical re-evaluation of the informational requirements of welfare economics and public decision-making. Research in this area explores diverse responses to these limitations, including the restriction of preference domains to achieve consistency, the relaxation of collective rationality requirements like transitivity, and the study of strategic manipulability in voting mechanisms. More recent developments incorporate richer informational bases, such as interpersonal utility comparisons and non-utility considerations like individual rights and liberty. The axiomatic methodology utilized in this field serves to clarify previously obscure problems in the relationship between individual preferences and social outcomes, offering a systematic way to assess the principles underlying institutional processes and social judgments. – AI-generated abstract.