Ethical concepts are, or purport to be, normative. They make claims on us: they command, oblige, recommend, or guide. Or at least when we invoke them, we make claims on one another; but where does their authority over us - or ours over one another - come from? Christine Korsgaard identifies four accounts of the source of normativity that have been advocated by modern moral philosophers: voluntarism, realism, reflective endorsement, and the appeal to autonomy. She traces their history, showing how each developed in response to the prior one and comparing their early versions with those on the contemporary philosophical scene. Kant's theory that normativity springs from our own autonomy emerges as a synthesis of the other three, and Korsgaard concludes with her own version of the Kantian account. Her discussion is followed by commentary from G. A. Cohen, Raymond Geuss, Thomas Nagel, and Bernard Williams, and a reply by Korsgaard.

Ethical concepts are, or purport to be, normative. They make claims on us: they command, oblige, recommend, or guide. Or at least when we invoke them, we make claims on one another; but where does their authority over us - or ours over one another - come from? Christine Korsgaard identifies four accounts of the source of normativity that have been advocated by modern moral philosophers: voluntarism, realism, reflective endorsement, and the appeal to autonomy. She traces their history, showing how each developed in response to the prior one and comparing their early versions with those on the contemporary philosophical scene. Kant's theory that normativity springs from our own autonomy emerges as a synthesis of the other three, and Korsgaard concludes with her own version of the Kantian account. Her discussion is followed by commentary from G. A. Cohen, Raymond Geuss, Thomas Nagel, and Bernard Williams, and a reply by Korsgaard.

Korsgaard's discussion of the source of normativity is followed by commentary from four distinguished philosophers.

Christine M. Korsgaard is one of today's leading moral philosophers: this volume collects ten influential papers by her on practical reason and moral psychology. Korsgaard draws on the work of important figures in the history of philosophy such as Plato, Aristotle, Kant, and Hume, showing how their ideas can inform the solution of contemporary and traditional philosophical problems, such as the foundations of morality and practical reason, the nature of agency, and the role of the emotions in action. In Part 1, The Principles of Practical Reason, Korsgaard defends the view that the principles of practical reason are constitutive principles of action. By governing our actions in accordance with Kant's categorical imperative and the principle of instrumental reason, she argues, we take control of our own movements and so render ourselves active, self-determining beings. She criticizes rival attempts to give a normative foundation to the principles of practical reason, challenges the claims of the principle of maximizing one's own interests to be a rational principle, and argues for some deep continuities between Plato's account of the connection between justice and agency and Kant's account of the connection between autonomy and agency. In Part II, Moral Virtue and Moral Psychology, Korsgaard takes up the question of the role of our more passive or receptive faculties--our emotions and responses --in constituting our agency. She sketches a reading of the Nicomachean Ethics, based on the idea that our emotions can serve as perceptions of good and evil, and argues that this view of the emotions is at the root of the apparent differences between Aristotle and Kant's accounts of morality. She argues that in fact, Aristotle and Kant share a distinctive view about the locus of moral value and the nature of human choice that, among other things, gives them account of what it means to act rationally that is superior to other accounts. In Part III, Other Reflections, Korsgaard takes up question how we come to view one another as moral agents in Hume's philosophy. She examines the possible clash between the agency of the state and that of the individual that led to Kant's paradoxical views about revolution. And finally, she discusses her methodology in an account of what it means to be a constructivist moral philosopher. The essays are united by an introduction in which Korsgaard explains their connections to each other and to her current work.

Christine Korsgaard has become one of the leading interpreters of Kant's moral philosophy. She is identified with a small group of philosophers who are intent on producing a version of Kant's moral philosophy that is at once sensitive to its historical roots while revealing its particular relevance to contemporary problems. She rejects the traditional picture of Kant's ethics as a cold vision of the moral life which emphasises duty at the expense of love and value. Rather, Kant's work is seen as providing a resource for addressing not only the metaphysics of morals, but also for tackling practical questions about personal relations, politics, and everyday human interaction. This collection contains some of the finest current work on Kant's ethics and will command the attention of all those involved in teaching and studying moral theory.

Christine M. Korsgaard presents an account of the foundation of practical reason and moral obligation. Moral philosophy aspires to understand the fact that human actions, unlike the actions of the other animals, can be morally good or bad, right or wrong. Few moral philosophers, however, have exploited the idea that actions might be morally good or bad in virtue of being good or bad of their kind - good or bad as actions. Just as we need to know that it is the function of the heart to pump blood to know that a good heart is one that pumps blood successfully, so we need to know what the function of an action is in order to know what counts as a good or bad action. Drawing on the work of Plato, Aristotle, and Kant, Korsgaard proposes that the function of an action is to constitute the agency and therefore the identity of the person who does it. As rational beings, we are aware of, and therefore in control of, the principles that govern our actions. A good action is one that constitutes its agent as the autonomous and efficacious cause of her own movements. These properties correspond, respectively, to Kant's two imperatives of practical reason. Conformity to the categorical imperative renders us autonomous, and conformity to the hypothetical imperative renders us efficacious. And in determining what effects we will have in the world, we are at the same time determining our own identities. Korsgaard develops a theory of action and of interaction, and of the form interaction must take if we are to have the integrity that, she argues, is essential for agency. On the basis of that theory, she argues that only morally good action can serve the function of action, which is self-constitution.

Both Kant’s and Hegel’s conceptions of normativity have shown to be extremely thorough and influential until today. Against the background of the much-disputed issue of ‘formalism’, Concepts of Normativity: Kant or Hegel? explores limits and perspectives of their deliberations.