Abstract
Mark Greenberg argues that legal obligations are those moral obligations created by the actions of legal institutions in the legally proper way (Moral Impact Theory of Law, MITL). Here I defend three main claims. First, I argue that, although very often misunderstood, Joseph Raz is also a defender of MITL. Secondly, I argue that while both Greenberg and Raz are committed to MITL, they disagree about the conditions under which a moral obligation can be said to be created in the legally proper way. Finally, I argue that Raz’s variant of MITL is better than Greenberg’s. It rests on a more plausible account of authority and it avoids one of the crucial defects threatening Greenberg’s view, namely, its overinclusiveness.