Introduction; One: Altruism; On the Concept of Altruism 1; Methodological Aspects of Altruism in Economics; Cooperation and Reciprocity; Two: Commitment; Beyond Altruism: Commitment?; The Ideal Observer: A Figure of Economic Theory; Kantian Economics: Retrospect and Prospect 1; Three: Responsibility; For a Positive Analysis of Responsibility and Duty; The Economic Person and Responsibility; Some Reflections on Responsibility and Happiness in Economics