 One traditional assumption about ethics is that our ethical obligations can be expressed by general ethical principles. This assumption has recently been challenged by ethical particularists, who claim that our ethical reasons and obligations cannot be codified into principles. Supervenience might seem to be relevant to this debate. For as  Section 3.2  above showed, some philosophers argue that the strong metaphysical supervenience of the ethical entails that for every ethical property, there will be a base property that is necessarily coextensive with it. Focusing on wrongness, this in turn has the apparent consequence that there is a base property B such that: