 Some of these attempts apply specifically to Wolff’s a priori attack on political authority and obligation, and others apply to philosophical anarchism in general. The arguments against Wolff usually concentrate on his conception of autonomy and its relation to authority. In brief, Wolff’s critics argue that he is wrong to insist that moral autonomy is our “primary” or “fundamental obligation,” for it “is, in fact, highly implausible to think that autonomy should invariably override all other values” (Horton, p. 127). Moreover, there is no reason to accept Wolff’s claim that autonomy and authority are necessarily incompatible. Insofar as autonomy is a capacity, as Wolff says, it will need to be developed before it can be exercised, and various kinds of authority – including political authority – will foster its development and make its continued exercise possible (Dagger 1997, pp. 66–68). Nor is it clear how Wolff can reject political authority without also rejecting promises and contracts as illegitimate constraints on one’s autonomy – a problem that leads even Simmons to declare Wolff’s a priori anarchism a “failed attempt” (2001, p. 111).