Skepticism about reasons fundamentalism

?Reasons fundamentalists? argue that the normativity of the reasons cannot be explained in terms of other normative concepts, and this claim is most closely related to the dogma that the reasons are the only fundamental elements of the normative domain. ?Ought fundamentalists? claim, however, that it is possible to show that the concept of ?ought? is the only foundation of normativity. There is doubt as to the exclusivity of both of these views.