This collection of essays on Harsanyi and Rawls is intended for audiences across economics, political science, and philosophy.

1. An introduction to justice, political liberalism, and utilitarianism Marc Fleurbaey, Maurice Salles and John A. Weymark; Part I. Themes from Rawls: 2. John Rawls's theory of justice: some critical comments John C. Harsanyi; 3. Rawls, responsibility, and distributive justice Richard Arneson; 4. Improving our ethical beliefs James Griffin; Part II. Harsanyi's Impartial Observer and Social Aggregation Theorems: 5. Harsanyi's impartial observer is not a utilitarian John E. Roemer; 6. Social aggregation and the expected utility hypothesis Charles Blackorby, David Donaldson and John A. Weymark; 7. A welfarist version of Harsanyi's aggregation theorem Claude d'Aspremont and Philippe Mongin; 8. Preference aggregation after Harsanyi Matthias Hild, Richard Jeffrey and Mathias Risse; Part III. Goodness and Well-Being: 9. Can there be a preference-based utilitarianism? John Broome; 10. Harsanyi, Rawls and the search for a common currency of advantage Robert Sugden; 11. Utilitarianism versus fairness in welfare economics Marc Fleurbaey and François Maniquet; 12. Rationality and want-satisfaction Brian Barry; Part IV. Sharing the Gains from Social Cooperation; 13. Naturalizing Harsanyi and Rawls Ken Binmore; 14. The social contract naturalized Brian Skyrms; 15. An alternative model of rational cooperation Edward F. McClennen; Part V. Rights and Liberties: 16. Republican political theory Philip Pettit; 17. Rule utilitarianism and liberal priorities Jonathan Riley.