This collection of essays by celebrated authors centers on ideas of rationality and morality in economics. The themes the essays cover are fundamental to economics: the influence of benevolence, altruism, justice and religious principles in our treatment of others in society; and the bases of rationality in decision making under conditions of uncertainty. These common themes are given a wide range of perspectives by the contributors, who discuss whether not just a "rational" but also a "thoughtful" economic man can be fitted into a sophisticated version of the orthodox model of man as a self-interested maximizer, or whether a radical upheaval in economic analysis is needed to accomodate him. The book is an examination by leading authorities of not only the role of rationality and morals in economics, but also the implications of conventional conceptions of rational economic man for all economic study. It constitutes a powerful argument for greater richness and subtlety in ideas about the motivations of individuals in their economic behavior.