Amartya Sen -- Cambridge, Mass. : Harvard University Press, c2017 xxxvii, 602 p. ; 22 cms. Incluye referencias bibliográficas e índice: pp. 491-601. Preface (1970) -- New preface (2017) -- Acknowledgements -- New introduction (2017) -- Collective choice and social welfare (1970) -- Introduction -- Preference relations -- Unanimity -- Collective choice rules and Pareto comparisons -- Collective rationality -- Social welfare functions -- Choice versus orderings -- Social decision functions -- Values and choice -- Anonymity, neutrality and responsiveness -- Conflicts and dilemmas -- The liberal paradox -- Interpersonal aggregation and comparability -- Aggregation quasi-orderings -- Cardinality with or without comparability -- Bargains and social welfare functions -- Equity and justice -- Impersonality and collective quasi-orderings -- Majority choice and related systems -- Restricted preferences and rational choice -- Theory and practice -- Collective choice and social welfare (2017) -- Enlightenment and impossibility -- Social preference -- Rationality and consistency -- Problems of social choice -- Justice and equity -- Social welfare evaluation -- Democracy and public engagement -- Votes and majorities -- The idea of rights -- Rights and social choice -- Reasoning and social decisions.