 Smith and Stoljar (1998) argue that the proponent of the possibility of bare dispositions is committed to there being relations of ‘bare similarity’ holding between possible worlds, which they take as unacceptable. McKitrick (2003b) argues in response, first, that Smith and Stoljar do not succeed in showing that the commitment to bare similarity follows from the possibility of bare dispositions, and, second, that even if it did then this would not be nearly as problematic as they take it to be. If one has already accepted that there might be bare dispositions then, McKitrick suggests, one should not be uncomfortable with the idea that there could be ‘barely similar’ possible worlds.