Psychological egoism claims that each person has but one ultimateaim: her own welfare. This allows for action that fails to maximizeperceived self-interest, but rules out the sort of behaviorpsychological egoists like to target — such as altruistic behavior ormotivation by thoughts of duty alone. It allows for weakness of will,since in weakness of will cases I am still aiming at my own welfare; Iam weak in that I do not act as I aim. And it allows for aiming atthings other than one's welfare, such as helping others, where thesethings are a means to one's welfare.


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