Metaethics and the Nature of Properties

This paper explores the connection between two philosophical debates concerning the nature of properties. The first, metaethical debate is about whether normative properties are ordinary natural properties or some unique kind of non-natural properties. The second, metaphysical debate is about whether properties are sets of objects, transcendent or immanent universals, or sets of tropes. I argue that nominalism, transcendent realism and immanent realism are not neutral frameworks for the metaethical debate but instead lead to either metaethical naturalism or non-naturalism. We can therefore investigate the metaethical question on its own terms only within the framework of trope theory.