 This argument itself, if successful, doesn’t show that dispositions must have distinct causal bases. It is consistent with the causal basis for a disposition being identical with the disposition itself. As we will see in  section 4.2,  however, Prior et al. do have at hand separate arguments for the thesis that dispositions are distinct from their causal bases. Taken together, these arguments will show the impossibility of bare dispositions. (See Hauska 2008a and Nolan 2015 for a criticism of Prior et al.’s argument.)