This article examines G. A. Cohen’s endorsement of a hybrid ethical theory and its relationship to his critique of John Rawls’s egalitarian liberalism. Cohen claimed that Rawls’s appeal to special incentives was a distortion of his own difference principle. I argue that Cohen’s acceptance of a personal prerogative (the central element of Samuel Scheffler’s version of a hybrid ethical theory) has several untoward consequences. First, it illuminates how any reasonable challenge to Rawls’s liberalism must recognise Thomas Nagel’s arguments concerning the (...) problems that arise when one attempts to implement a political theory analogous to a hybrid theory of ethics. Second, it undermines Cohen’s critique of Rawls. Third, it undermines the plausibility of Cohen’s ethos-driven social egalitarianism. The article concludes that, despite Nagel’s concerns, the most plausible form of egalitarianism—one that can accommodate the requirements of a hybrid ethical theory—will be Rawlsian, rather than Cohen’s ethos-based system. (shrink)