 Authors working within the Kantian tradition have elaborated and defended various versions of the claim that autonomy, or the capacity to set ends according to reason, is unconditionally valuable and the ultimate condition of value of everything else (see the entry on  autonomy in moral and political philosophy,  sections 2 and 2.1). Numerous variants of the argument for this claim can be found in the literature, and the most prominent ones take the transcendental form (see the entry on  transcendental arguments,  section 5). On one version, in rationally choosing or valuing anything at all one must presuppose the supreme value of one’s own rational capacities, and, by extension, the supreme value of rational capacities in general (Korsgaard 1996a and 1996b). On this picture, rational agents must recognize the supreme value of rational capacities as a condition of valuing anything else, and this recognition takes the form of affording FMS to beings with rational capacities. This argument has spawned numerous responses from both critics and proponents. For critiques, see, for example, Regan (2002) and Bukoski (2018). For alternative defenses and responses on the Kantians’ behalf, see Sussman (2003).