PERSON
Kenneth Arrow
American economist (1921–2017), Nobel laureate, whose 1951 Social Choice and Individual Values generalized the Condorcet paradox into the impossibility theorem that bears his name — proving no aggregation procedure can satisfy a small set of reasonable conditions simultaneously.
Kenneth Arrow was among the most influential economists of the twentieth century, with contributions to general equilibrium theory, the economics of information, and social choice. His 1951 doctoral dissertation, published as Social Choice and Individual Values, formalized and generalized Condorcet's paradox into a theorem demonstrating that no method of aggregating individual preference orderings into a collective ranking can simultaneously satisfy non-dictatorship, unanimity, independence of irrelevant alternatives, and unrestricted domain. The theorem won him (with John Hicks) the Nobel Prize in 1972 and has shaped every subsequent effort to design democratic procedures, voting systems, and — more recently — methods for aligning AI systems with diverse human values.
In The You On AI Field Guide
Arrow's relation to Condorcet is not merely historical. The impossibility theorem is the mathematical culmination of the program Condorcet began in the Essai: the rigorous analysis of what collective decision-making can and cannot achieve. Condorcet discovered the paradox and documented its