This is a defense of John Stuart Mill’s proof of the principle of utility in the fourth chapter of his Utilitarianism. The proof is notorious as a fallacious attempt by a prominent philosopher, who ought not to have made the elementary mistakes he is supposed to have made. This book shows that he did not. The aim is not to glorify utilitarianism, in a full sweep, as the best normative ethical theory, or even to vindicate, on a more specific level, (...) Mill’s universalistic ethical hedonism as the best form of utilitarianism. The book is concerned only with Mill’s utilitarianism, and primarily with his proof of the principle of utility. The purpose is to show that Mill proceeds intelligibly and systematically in pursuing a well-defined project in the fourth chapter of Utilitarianism, and that he successfully defends what he sets out to establish in his proof of the principle of utility. (shrink)

John Stuart Mill's commitment to liberty and individual development is one of the most exoteric themes of his moral and political philosophy. But the linkages between this commitment to liberty and development and Mill's conception of utility and principles of the good are not as commonly recognized. As part of a more general transformation of his utilitarianism, Mill repudiated Bentham's principles of the good and instead adopted a more sophisticated form of hedonism. While Bentham admits only the total quantity of (...) pleasure as contributing to value, Mill expands the circle to admit quality or kind of pleasure as well into the value reckoning. I have elsewhere interpreted and defended Mill's qualitative hedonism, and in this paper I can offer only a brief overview of that account and must largely assume its plausibility. Bentham and Mill agree that only pleasurable experiences and the absence of painful experiences have value and so both are called hedonists. But they have very different views about what properties of pleasures makes them valuable, or in other words what are the good-making properties of pleasure. Bentham thinks that only intensity and duration, or quantity, are good-making properties of pleasures, and thus he includes only these properties in measuring value. As a consequence, in the context of value measurement he is not interested in the kinds of things in which people take pleasure. But Mill is a qualitative hedonist, and thinks that the quality or kind of pleasure is also a good-making characteristic and thus should be included in value measurement. The things that are sources of pleasure matter to Mill. (shrink)