Abstract This is a book on welfare and its importance for distributive justice. Part I is concerned with prudence; more precisely, with what the necessary and sufficient conditions are for having a self‐interest in a particular benefit. It includes discussions of the extent to which self‐interest depends on preferences, personal identity, and what matters in survival. It also considers the issue of whether it can benefit (or harm) a person to come into existence and what the implications are for our theory of self‐interest. A ‘Prudential View’ is defended, according to which a person has a present self‐interest in a future benefit if and only if she stands in a relation of continuous physical realization of (appropriate) psychology to the beneficiary, where the strength of the self‐interest depends both on the size of the benefit and on the strength of this relation. Part II concerns distributive justice and so how to distribute welfare or self‐interest fulfilment over individuals. It includes discussions of welfarism, egalitarianism and prioritarianism, population ethics, the importance of personal identity and what matters for distributive justice, and the importance of all these issues for various topics in applied ethics, including the badness of death. Here, a version of prioritarianism is defended, according to which, roughly, the moral value of a benefit to an individual at one time depends on both the size of the benefit and on the individual's self‐interest, at that time, in the other benefits that accrue to her at this and other times.
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