Winner of the 1975 National Book Award, this brilliant and widely acclaimed book is a powerful philosophical challenge to the most widely held political and social positions of our age--liberal, socialist, and conservative.

I here defend historical entitlement theories of property rights against a popular charge. This is the objection that such theories fail because no convincing account of original appropriation exists. I argue that this argument assumes a certain reading of historical entitlement theory and I spell out an alternative reading against which it misfires. On this reading, the role of acts of original appropriation is not to justify but to individuate people’s holdings. I argue that we can identify which acts count (...) as original appropriation against the background of a general justification for a practice of property rights. On this view, what I will call ‘natural’ acts of original appropriation are acts by which a person begins to satisfy the general conditions for justified ownership. Finally, I offer an interpretation of John Locke's theory of appropriation along these lines and argue that it provides an attractive reading of his view. (shrink)

There is an important distinction between a person's ’initial genetic endowment’ and his ’post‐conception inputs’ such as nutrition and education. From a left‐libertarian perspective that views persons as self‐owning, children have an enforceable claim that parents should provide adequate ’post‐conception’ inputs. Moreover, with the revolution in genetic science, it is now possible to effect genetic changes without altering identity. If so, children can, in principle, claim a right against ’genetic‐disablement’.

Interpreters of Robert Nozick’s political philosophy fall into two broad groups concerning his application of the ‘Lockean proviso’. Some read his argument in an undemanding way: individual instances of ownership which make people worse off than they would have been in a world without any ownership are unjust. Others read the argument in a demanding way: individual instances of ownership which make people worse off than they would have been in a world without that particular ownership are unjust. While I (...) argue that the former reading is correct as an interpretive matter, I suggest that this reading is nonetheless highly demanding. In particular, I argue that it is demanding when it is expanded to include the protection of nonhuman animals; if such beings are right bearers, as more and more academics are beginning to suggest, then there is no nonarbitrary reason to exclude them from the protection of the proviso. (shrink)

David Lewis (1941-2001) was Class of 1943 University Professor of Philosophy at Princeton University. His contributions spanned philosophical logic, philosophy of language, philosophy of mind, philosophy of science, metaphysics, and epistemology. In On the Plurality of Worlds, he defended his challenging metaphysical position, "modal realism." He was also the author of the books Convention, Counterfactuals, Parts of Classes, and several volumes of collected papers.

There is a de re modal truth that proves inconvenient for the canonical Lewisian theory of modality. For this truth requires on that theory, the existence of things (counterparts) that exist in distinct worlds but are also spatiotemporally related.

Libertarianism holds that agents initially fully own themselves and have moral powers to acquire property rights in external things under certain conditions. It is normally advocated as a theory of justice in the sense of the duties that we owe each other. So understood, it is silent about any impersonal duties (i.e., duties owed to no one) that we may have.