The personal identity literature is fragmented. There is a literature on the normative topic of 'what matters in survival' and there is a separate literature on the metaphysics of persons. But in Self and Identity, Trenton Merricks shows that some important claims about personal identity can't even be articulated, much less evaluated, unless these topics are brought together. Merricks says that what matters in survival is constituted by its being appropriate for a present person to first-personally anticipate, and have self-interested concern with regard to, a future person's experiences. So what matters in survival is not constituted by identity with a future person; identity is not what matters in survival. But Merricks argues that—given a metaphysics of 'enduring' persons—identity with a future person explains why it is appropriate to first-personally anticipate, and have self-interested concern with regard to, that person's experiences. So identity delivers what matters in