Arrow’s (im)possibility theorem
Résumé
Arrow’s (im)possibility theorem is one of the most famous and important contri-
butions in economics. It concerns the difficulty to aggregate a set of individual
preferences, given as rankings of a set of available alternatives, into a unique social
preferences ranking via a social welfare function, or into a unique social choice.
Arrow proves that in a specific framework, it is impossible to find a social welfare
function which simultaneously satisfies four conditions: universal domain, weak
Pareto principle, independence of irrelevant alternatives, and no dictator. Our no-
tice presents this theorem, one of its proofs, and, we hope, invites the reader to
discover social choice theory
Origine : Fichiers produits par l'(les) auteur(s)
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