Positive and Negative Constitutionalism and the Limits of Universalism: A Review Essay†

—In The Principles of Constitutionalism, Nicholas Barber provides a sophisticated yet highly readable introduction to fundamental constitutional principles. At the same time, Barber seeks to reorient constitutional theory scholarship away from a mistaken ‘negative’ understanding of constitutionalism towards a ‘positive’ understanding. This essay examines that argument. We suggest that the idea of ‘positive constitutionalism’ has a weaker and a stronger sense. In its weak form, the argument calls for greater attention to what constitutions enable as well as what they restrict, and thus serves as a welcome reminder of the full potential of constitutional principles. However, it cannot be regarded as the correction of a widespread mistake. In its strong form, the argument calls for greater recognition that the state’s essential function lies in advancing the ‘well-being’ of its members. Although this amounts to a significant reorientation, it weakens the theory’s claim to universalism. These tensions indicate limitations to efforts to construct general theories of constitutionalism.