  A much more promising approach to the normativity of law is found in Joseph Raz’s theory of authority, which also shows how such a theory about the normativity of law entails important conclusions with respect to the conditions of legal validity (Raz 1994). The basic insight of Raz’s argument is that the law is an authoritative social institution. The law, Raz claims, is a de facto authority. However, it is also essential to law that it must be held to claim legitimate authority. Any particular legal system may fail, of course, in its fulfillment of this claim. But law is the kind of institution which necessarily claims to be a legitimate authority.