Abstract
As standardly understood, for an act to be optional is for it to be permissible but not required. Supererogatory acts are commonly taken to be optional in this way. In “Supererogation, Optionality and Cost”, Claire Benn rejects this common view: she argues that optionality so understood—permissible but not required—cannot be the sort of optionality involved in supererogation. As an alternative, she offers a novel account of the optionality of supererogatory acts: the “comparative cost” account. In this paper, we rebut Benn’s objection to the common view that supererogation involves optionality as standardly understood. We also point out that her objection, if it worked, would equally undermine her own comparative cost proposal.