This study uses techniques from economics to illuminate fundamental questions in ethics, particularly in the foundations of utilitarianism. Topics considered include the nature of teleological ethics, the foundations of decision theory, the value of equality and the moral significance of a person's continuing identity through time.

Fifteen essays offer a comprehensive evaluation of Broome's philosophical works over the past thirty years. The first part focuses on Broome's work on the theory of value; the second part on his work on practical and theoretical reasoning, which culminated in his rationality through reasoning.

This book examines the calculation and evaluation of regulatory costs by regulators in accordance with a legislative mandate. A serious limitation in that enterprise, the possibility of technological change and innovation, often compromises those efforts and has long been under-appreciated in standard ‘cost-benefit analysis.’ Regulators who study the inducement of innovation and the avoidance of regulatory costs by the regulated often find significant cost-saving opportunities, leading to more stringent and more effective risk governance. Ultimately, the weighing of costs in this more elaborate model is more than simple welfare maximization. It views regulatory costs as important to society for a range of reasons, some grounded in fairness and some in deliberative process values, as a society seeks to minimize all costs over time.

We are often faced with choices that involve the weighing of people's lives against each other, or the weighing of lives against other good things. These are choices both for individuals and for societies. A person who is terminally ill may have to choose between palliative care and more aggressive treatment, which will give her a longer life but at some cost in suffering. We have to choose between the convenience to ourselves of road and air travel, and the lives of the future people whowill be killed by the global warming we cause, through violent weather, tropical disease, and heat waves. We also make choices that affect how many lives there will be in the future: as individuals we choose how many children to have, and societies choose tax policies that influence people's choices about having children. These are all problems of weighing lives. How should we weigh lives? Weighing Lives develops a theoretical basis for answering this practical question. It extends the work and methods of Broome's earlier book Weighing Goods to cover the questions of life and death. Difficult problems come up in the process. In particular, Weighing Lives tackles the well-recognized, awkward problems of the ethics of population. It carefully examines the common intuition that adding people to the population is ethically neutral - neither a good nor a bad thing - but eventually concludes this intuition cannot be fitted into a coherent theory of value. In the course of its argument,Weighing Lives examines many of the issues of contemporary moral theory: the nature of consequentialism and teleology; the transitivity, continuity, and vagueness of betterness; the quantitative conception of wellbeing; the notion of a life worth living; the badness of death; and others. This is a work of philosophy, but one of its distinctive features is that it adopts some of the precise methods of economic theory (without introducing complex mathematics). Not only philosophers, but also economists and political theorists concerned with the practical question of valuing life, should find the book's conclusions highly significant to their work.