We all have ethical beliefs. We may believe, for example, that torture is wrong, that compassion is a virtue, and that it is rational to promote what one values. These beliefs are normative; they concern what we ought or ought not to do, or what is valuable or worthy of our choosing, or what a society must try to guarantee. The problem of normativity is to explain what the normativity of these beliefs comes to. What is it for an ethical claim, an...