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I develop and defend the following neo-Aristotelian account of supererogation: an action is supererogatory if and only if it is overall virtuous and either (a) the omission of an overall virtuous action in that situation would not be overall vicious or (b) there is some overall virtuous action that is less virtuous than it and whose performance in its place would not be overall vicious. I develop this account from within the virtue-ethical tradition. And I argue that it is intuitively defensible and fully compatible with the doctrine of the mean.
Rebecca Stangl (2015) studied this question.