Frank Cowell: Welfare Basics Axioms on the constitution  Universality  should be defined for all profiles of preferences  Pareto Unanimity if all consider that  is better than  , then the social ordering should rank  as better than   Independence of Irrelevant Alternatives if two profiles are identical over a subset of  then the derived social orderings should also be identical over this subset  Non-Dictatorship no one person alone can determine the social ordering More on IIA March 2012 12
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