The Duty Argument employs the box and diamond in the standard fashion as operators for, respectively, conceptual necessity and possibility. The alpha is just a placeholder for actions, or kinds of actions. The locution “(overall) rational” or “(overall) irrational” presupposes that there are various kinds of rationality, including moral rationality, epistemic rationality, and prudential rationality.[10] The idea that there are various kinds of rationality, or put any way, that one can be under