Moral judgments attempt to describe a reality that does not exist, so they are all false. This is the moral error theory, a deeply troubling yet plausible view that is now one of the canonical positions in moral philosophy. The most compelling argument against it is the argument from analogy. According to this, the moral error theory should be rejected because it would seriously compromise our practice of making epistemic judgments-judgments about how we ought to form and revise our beliefs in light of our evidence-and could undermine systematic thought and reason themselves. Christopher Cowie provides a novel assessment of the recent attention paid to this topic in moral philosophy and epistemology. He reasons that the argument from analogy fails because moral judgments are unlike judgments about how we ought to form and revise our beliefs in light of our evidence. On that basis, a moral error theory does not compromise the practice of making epistemic judgments. The moral error theory may be true after all, Cowie concludes, and if it is then we will simply have to live with its concerning consequences.

The Repugnant Conclusion is a controversial theorem about population size. It states that a sufficiently large population of lives that are barely worth living is better than a smaller population of high quality lives. This is highly counter-intuitive. It implies that we can improve the world by trading quality of life for quantity of lives. Can it be defended? Christopher Cowie explores these questions and unpacks the controversies surrounding the Repugnant Conclusion. He focuses on whether the truth of the Repugnant Conclusion turns - as some have claimed - on the uncomfortable claim that many people's lives are actually bad for them and that even privileged people lead lives that are only just worth living. Highly recommended for those interested in ethics, applied ethics and population studies The Repugnant Conclusion will also be of interest to those in related disciplines such as economics, development studies, politics and international relations.

Comparisons between morality and other 'companion' disciplines - such as mathematics, religion, or aesthetics - are commonly used in philosophy, often in the context of arguing for the objectivity of morality. This is known as the 'companions in guilt' strategy. It has been the subject of much debate in contemporary ethics and metaethics. This volume, the first full length examination of companions in guilt arguments, comprises an introduction by the editors and a dozen new chapters by leading authors in the field. They examine the methodology of companions in guilt arguments and their use in responding to the moral error theory, as well as specific arguments that take mathematics, epistemic norms, or aesthetics as a 'companion', and the use of the companions in guilt strategy to vindicate claims to moral knowledge. Companions in Guilt Arguments in Metaethics is essential reading for advanced students and researchers working in moral theory and metaethics, as well as those in epistemology and philosophy of mathematics concerned with the intersection of these subjects with ethics.