 The first account is by Henry Richardson (1994). Richardson argues for the possibility of rational deliberation about ends. According to Richardson, if comparability is a prerequisite for rational choice, choices involving conflicting values could be made rationally if each of the values were expressed in terms of their contribution to furthering some common end. This conception of choice treats this common end as the one final end relevant for the choice. According to Richardson, the idea that comparability is a prerequisite for rational choice seems to rule out rational deliberation about ends (1994, 15).