The Scale of Normative Reasons

Normative notions are often explained in terms of reasons, which (allegedly) can be weighted and combined, for instance in order to know what one ought to do. But what is their weight? How do they combine? This chapter applies measurement theory to these questions. I argue that normative reasons cannot be consistently weighted and aggregated for purely formal, rather than substantial, reasons and that this is a prima facie novel, non ad hoc argument for normative particularism.