 The principle-based version of the agent-relative/agent-neutral distinction actually predates the terminology ‘agent-relative’ and ‘agent-neutral’. Thomas Nagel instead uses the terms ‘subjective’ and ‘objective’ to mark a version of the principle-based distinction in his classic The Possibility of Altruism (Nagel 1970). The terms ‘agent-relative’ and ‘agent-neutral’ were later introduced by Derek Parfit (Parfit 1984) and Nagel himself then adopted Parfit’s terminology (Nagel 1986). As background to Nagel’s version of the distinction, we must first note that for Nagel, reasons are universal, in the sense that for every token reason there corresponds a predicate R which figures in a universally quantified proposition of the following form: