James Bernard Murphy is Professor of Government at Dartmouth College, in Hanover, NH. His books include: The Moral Economy of Labor: Aristotelian Themes in Economic Theory (Yale University Press); The Philosophy of Positive Law: Foundations of Jurisprudence (Yale University Press); The Philosophy of Customary Law (Oxford University Press); and The Nature of Customary Law: Legal, Historical, and Philosophical Perspectives (co-edited with Amanda Perrreau-Saussine; Cambridge University Press).