 Refinement of preferences is usually assumed to result in the person’s (hypothetical) “rational” or “ideally considered” preferences. “My ideally considered preferences are those I would have if I were to engage in thoroughgoing deliberation about my preferences with full pertinent information, in a calm mood, while thinking clearly and making no reasoning errors.” (Arneson 1989, 83; cf. Brandt 1979 and Rosati 2009) A problem for this view is that there does not seem to be any easy way to determine, based on a person’s preferences and circumstances, what her ideally considered preferences would be. 