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.

Challenging, with several powerful arguments, some of our deepest beliefs about rationality, morality, and personal identity, Parfit claims that we have a false view about our own nature. It is often rational to act against our own best interersts, he argues, and most of us have moral views that are self-defeating. We often act wrongly, although we know there will be no one with serious grounds for complaint, and when we consider future generations it is very hard to avoid conclusions (...) that most of us will find very disturbing. (shrink)

In this entry, we discuss both the definition of effective altruism and objections to effective altruism, so defined.

Given the deep disagreement surrounding population axiology, one should remain uncertain about which theory is best. However, this uncertainty need not leave one neutral about which acts are better or worse. We show that, as the number of lives at stake grows, the Expected Moral Value approach to axiological uncertainty systematically pushes one toward choosing the option preferred by the Total View and critical-level views, even if one’s credence in those theories is low.

Population axiology is the study of the conditions under which one state of affairs is better than another, when the states of affairs in ques- tion may differ over the numbers and the identities of the persons who ever live. Extant theories include totalism, averagism, variable value theories, critical level theories, and “person-affecting” theories. Each of these the- ories is open to objections that are at least prima facie serious. A series of impossibility theorems shows that this is no coincidence: (...) it can be proved, for various sets of prima facie intuitively compelling desiderata, that no axiology can simultaneously satisfy all the desiderata on the list. One’s choice of population axiology appears to be a choice of which intuition one is least unwilling to give up. (shrink)

What moral reasons, if any, do we have to ensure the long-term survival of humanity? This article contrastively explores two answers to this question: according to the first, we should ensure the survival of humanity because we have reason to maximize the number of happy lives that are ever lived, all else equal. According to the second, seeking to sustain humanity into the future is the appropriate response to the final value of humanity itself. Along the way, the article discusses (...) various issues in population axiology, particularly the so-called Intuition of Neutrality and John Broome’s ‘greediness objection’ to this intuition. (shrink)

In slogan form, the thesis of this dissertation is that shaping the far future is overwhelmingly important. More precisely, I argue that: Main Thesis: From a global perspective, what matters most is that we do what is best for the general trajectory along which our descendants develop over the coming millions, billions, and trillions of years. The first chapter introduces some key concepts, clarifies the main thesis, and outlines what follows in later chapters. Some of the key concepts include: existential (...) risk, the world's development trajectory, proximate benefits and ripple effects, speeding up development, trajectory changes, and the distinction between broad and targeted attempts to shape the far future. The second chapter is a defense of some methodological assumptions for developing normative theories which makes my thesis more plausible. In the third chapter, I introduce and begin to defend some key empirical and normative assumptions which, if true, strongly support my main thesis. In the fourth and fifth chapters, I argue against two of the strongest objections to my arguments. These objections come from population ethics, and are based on Person-Affecting Views and views according to which additional lives have diminishing marginal value. I argue that these views face extreme difficulties and cannot plausibly be used to rebut my arguments. In the sixth and seventh chapters, I discuss a decision-theoretic paradox which is relevant to my arguments. The simplest plausible theoretical assumptions which support my main thesis imply a view I call fanaticism, according to which any non-zero probability of an infinitely good outcome, no matter how small, is better than any probability of a finitely good outcome. I argue that denying fanaticism is inconsistent with other normative principles that seem very obvious, so that we are faced with a paradox. I have no solution to the paradox; I instead argue that we should continue to use our inconsistent principles, but we should use them tastefully. We should do this because, currently, we know of no consistent set of principles which does better. (shrink)

In the international bestseller, Thinking, Fast and Slow, Daniel Kahneman, the renowned psychologist and winner of the Nobel Prize in Economics, takes us on a groundbreaking tour of the mind and explains the two systems that drive the way we think. System 1 is fast, intuitive, and emotional; System 2 is slower, more deliberative, and more logical. The impact of overconfidence on corporate strategies, the difficulties of predicting what will make us happy in the future, the profound effect of cognitive (...) biases on everything from playing the stock market to planning our next vacation—each of these can be understood only by knowing how the two systems shape our judgments and decisions. -/- Engaging the reader in a lively conversation about how we think, Kahneman reveals where we can and cannot trust our intuitions and how we can tap into the benefits of slow thinking. He offers practical and enlightening insights into how choices are made in both our business and our personal lives—and how we can use different techniques to guard against the mental glitches that often get us into trouble. Winner of the National Academy of Sciences Best Book Award and the Los Angeles Times Book Prize and selected by The New York Times Book Review as one of the ten best books of 2011, Thinking, Fast and Slow is destined to be a classic. (shrink)

Death is something we mourn or fear as the worst thing that could happen―whether the deaths of close ones, the deaths of strangers in reported accidents or tragedies, or our own. And yet, being dead is something that no one can experience and live to describe. This simple truth raises a host of difficult philosophical questions about the negativity surrounding our sense of death, and how and for whom exactly it is harmful. The question of whether death is bad has (...) occupied philosophers for centuries, and the debate emerging in philosophical literature is referred to as the "badness of death." Are deaths primarily negative for the survivors, or does death also affect the deceased? What are the differences between death in fetal life, just after birth, or in adolescence? In order to properly evaluate deaths in global health, we must find answers to these questions. -/- In this volume, leading philosophers, medical doctors, and economists discuss different views on how to evaluate death and its relevance for health policy. This includes theories about the harm of death and its connections to population-level bioethics. For example, one of the standard views in global health is that newborn deaths are among the worst types of death, yet stillbirths are neglected. This raises difficult questions about why birth is so significant, and several of the book's authors challenge this standard view. -/- This is the first volume to connect philosophical discussions on the harm of death with discussions on population health, adjusting the ways in which death is evaluated. Changing these evaluations has consequences for how we prioritize different health programs that affect individuals at different ages, as well as how we understand inequality in health. (shrink)

Do the new sciences of well-being provide knowledge that respects the nature of well-being? This book written from the perspective of philosophy of science articulates how this field can speak to well-being proper and can do so in a way that respects the demands of objectivity and measurement.

The cofounder of the Effective Altruism movement presents a counterintuitive approach anyone can use to make a difference in the world. While studying philosophy at Oxford University and trying to work out how he could have the greatest impact, William MacAskill discovered that most of the time and money aimed at making the world a better place achieves little. Why? Because individuals rarely have enough information to make the best choices. Confronting this problem head-on, MacAskill developed the concept of effective (...) altruism, a scientific, data-driven approach to making a difference that operates by asking these five questions: How much will this action improve others' lives? Is this the most effective action I can take? How useful is my contribution, given what others are already doing? What will happen if I don't do it? What are the chances of success, and how good would success be? Applying these principles, he demonstrates that many of our assumptions about doing good are misguided: he argues that one can potentially save more lives by working on Wall Street than as a heart surgeon, that cancer charities are not the best use of money, and that buying sweatshop-produced goods is a form of ethical consumption. MacAskill challenges us to think differently but argues that if we set aside our biases and rely on evidence and careful reasoning, each of us can make a tremendous difference. (shrink)

Many believe that we ought to save a large number from being permanently bedridden rather than save one from death. Many also believe that we ought to save one from death rather than a multitude from a very minor harm, no matter how large this multitude. I argue that a principle I call “Aggregate Relevant Claims” satisfactorily explains these judgments. I offer a rationale for this principle and defend it against objections.

One widespread argument against the efficacy of subjective well-being as a measure of well-being is the adaptation problem as formulated by Sen and Nussbaum: the phenomenon that people may adapt to deprivation and find satisfaction or happiness in objectively bad circumstances. It is not generally noticed that there are two distinct arguments for why the phenomenon of adaptation is a problem for subjective well-being as a measure of well-being. The Axiological Adaptation Argument is a counter-example to theories of well-being that (...) rely on mental states. The Epistemic Adaptation Argument illustrates that levels of happiness or satisfaction cannot be measured well when people have adapted. I argue that the most serious threat to subjective well-being measures is not the Axiological Argument, but the Epistemic Argument. I reflect on the implications the epistemic problem has for the empirical literature in general, and for research on the phenomenon of adaptation in particular. (shrink)

Well-being in the broadest sense is what we have when we are living lives that are not necessarily morally good, but good for us. In philosophy, well-being has been an important topic of inquiry for millennia. In psychology, well-being as a topic has been gathering steam very recently and this research is now at a stage that warrants the attention of philosophers. The most popular theories of well-being in the two fields are similar enough to suggest the possibility of interdisciplinary (...) collaboration. In this essay I provide an overview of three of the main questions that arise from psychologists’ work on well-being, and highlight areas that invite philosophical input. Those questions center on the nature, measurement, and moral significance of well-being. I also argue that the life-satisfaction theory is particularly well suited to meet the various demands on a theory of well-being. (shrink)

From the ethicist the_ New Yorker_ calls “the most influential living philosopher,” a new way of thinking about living ethically.

Effective altruism is the use of evidence and reason to figure out how to benefit others as much as possible and the taking of action on that basis. This chapter discusses the moral framework and methodological approach that effective altruism uses to prioritize causes, charities, and careers, and examines some of the world problems that, on this perspective, appear to be most urgent and important: global health and development, non-human animal suffering, and risks to long-term human survival. It then lays (...) out some of the most important unsolved problems facing the effective altruist project. (shrink)

In his recent work, Parfit returns to the examination of the non-identity problem, but this time not in the context of a theory of value but as part of a Scanlonian theory of reasons for action. His project is to find a middle ground between pure impersonalism and the narrow person-affecting view so as to do justice to some of our fundamental intuitions regarding procreative choices. The aim of this article is to show that despite the sophisticated and challenging thought (...) experiments and conceptual suggestions , Parfit’s project fails and that we are left with the stark choice between personalism and impersonalism. (shrink)

Abstracts These are abstracts of the papers that receive a reply, not of the replies themselves. The abstracts appear in the alphabetical order of the authors' names; for the contributions to the ...

This paper is a plea for hedonism to be taken more seriously. It begins by charting hedonism's decline, and suggests that this is a result of two major objections: the claim that hedonism is the 'philosophy of swine', reducing all value to a single common denominator, and Nozick's 'experience machine' objection. There follows some elucidation of the nature of hedonism, and of enjoyment in particular. Two types of theory of enjoyment are outlined-intemalism, according to which enjoyment has some special 'feeling (...) tone'. and externalism, according to which enjoyment is any kind of experience to which we take some special attitude, such as that of desire. lnternalism-the traditional view--is defended against current externalist orthodoxy. The paper ends with responses to the philosophy of swine and the experience machine objections. (shrink)

This paper is a plea for hedonism to be taken more seriously. It begins by charting hedonism's decline, and suggests that this is a result of two major objections: the claim that hedonism is the ‘philosophy of swine’, reducing all value to a single common denominator, and Nozick's ‘experience machine’ objection. There follows some elucidation of the nature of hedonism, and of enjoyment in particular. Two types of theory of enjoyment are outlined–internalism, according to which enjoyment has some special ‘feeling (...) tone’, and externalism, according to which enjoyment is any kind of experience to which we take some special attitude, such as that of desire. Internalism–the traditional view–is defended against current externalist orthodoxy. The paper ends with responses to the philosophy of swine and the experience machine objections. (shrink)

What should we do when we are not certain about what we morally should do? There is a long history of theorizing about decision-making under empirical uncertainty, but surprisingly little has been written about the moral uncertainty expressed by this question. Only very recently have philosophers started to systematically address the nature of such uncertainty and its impacts on decision-making. This paper addresses the main problems raised by moral uncertainty and critically examines some proposed solutions.

In 1972, the young philosopher Peter Singer published "Famine, Affluence and Morality," which rapidly became one of the most widely discussed essays in applied ethics. Through this article, Singer presents his view that we have the same moral obligations to those far away as we do to those close to us. He argued that choosing not to send life-saving money to starving people on the other side of the earth is the moral equivalent of neglecting to save drowning children because (...) we prefer not to muddy our shoes. If we can help, we must--and any excuse is hypocrisy. Singer's extreme stand on our moral obligations to others became a powerful call to arms and continues to challenge people's attitudes towards extreme poverty. Today, it remains a central touchstone for those who argue we should all help others more than we do. As Bill and Melinda Gates observe in their foreword, in the age of today's global philanthropy, Singer's essay is as relevant now as it ever was. This attractively packaged, concise edition collects the original article, two of Singer's more recent popular writings on our obligations to others around the world, and a new introduction by Singer that discusses his current thinking. (shrink)

It seems to be a widespread opinion that increasing the length of existing happy lives is better than creating new happy lives although the total welfare is the same in both cases, and that it may be better even when the total welfare is lower in the outcome with extended lives. I shall discuss two interesting suggestion that seems to support this idea, or so it has been argued. Firstly, the idea there is a positive level of wellbeing above which (...) a life has to reach to have positive contributive value to a population, so-called Critical Level Utilitarianism. Secondly, the view that it makes an outcome worse if people are worse off than they otherwise could have been, a view I call Comparativism. I shall show that although these theories do capture some of our intuitions about the value of longevity, they have such counterintuitive implications in other cases that we ultimately have to reject them. (shrink)

Much recent philosophical literature on happiness and satisfaction is based on the belief that empirical research is relevant to philosophical conclusions. In his2010 book What is This Thing Called Happiness? Fred Feldman begs to differ. He suggests that there is no evidence that empirical research is relevant to long-standing philosophical questions; consequently, that philosophers have little reason to pay attention to the work of psychologists or economists; and that philosophers need not fear embarrassing themselves by being ignorant of important scientific (...) findings that bear directly on their work. Relying on an example invoked by Feldman himself, this paper makes the case that all three theses are false. The argument suggests a picture according to which science and philosophy stand in a symbiotic relationship, with scientists and philosophers engaging in a mutually beneficial exchange of ideas for the advancement of thegeneral knowledge. (shrink)

A ubiquitous argument against mental-state accounts of well-being is based on the notion that mental states like happiness and satisfaction simply cannot be measured. The purpose of this paper is to articulate and to assess this “argument from measurability.” My main thesis is that the argument fails: on the most charitable interpretation, it relies on the false proposition that measurement requires the existence of an observable ordering satisfying conditions like transitivity. The failure of the argument from measurability, however, does not (...) translate into a defense of mental-state accounts as accounts of well-being or of measures of happiness and satisfaction as measures of well-being. Indeed, I argue, the ubiquity of the argument from measurability may have obscured other, very real problems associated with mental-state accounts of well-being – above all, that happiness and satisfaction fail to track well-being – and with measures of happiness and satisfaction – above all, the tendency toward reification. I conclude that the central problem associated with the measurement of, e.g., happiness as a subjectively experienced mental state is not that it is too hard to measure, but rather that it is too easy to measure. (shrink)

In Valuing Health, Dan Hausman argues that well-being is not measurable, at least not in the way that science and policy would require. His argument depends on a demanding conception of well-being and on a pessimistic verdict upon the existing measures of subjective well-being. Neither of these reasons, I argue, warrant as much skepticism as Hausman professes.

What makes a measure of well-being valid? The dominant approach today, construct validation, uses psychometrics to ensure that questionnaires behave in accordance with background knowledge. Our first claim is interpretive—construct validation obeys a coherentist logic that seeks to balance diverse sources of evidence about the construct in question. Our second claim is critical—while in theory this logic is defensible, in practice it does not secure valid measures. We argue that the practice of construct validation in well-being research is theory avoidant, (...) favoring a narrow focus on statistical tests while largely ignoring relevant philosophical considerations. (shrink)

Introduction to one of the most important, controversial, and suggestive works of moral philosophy ever written.

John Stuart Mill's Utilitarianism is one of the most important, controversial, and suggestive works of moral philosophy ever written. Published in the Oxford Philosophical Texts series, this new edition of Mill's key text has been designed to suit both the beginning and more advanced student. The text is supplemented by an extensive editorial introduction, an analysis of the text, substantial endnotes, suggestions for further reading, and a full bibliography.

How many people should there be? Can there be overpopulation: too many people living? I shall present a puzzling argument about these questions, show how this argument can be strengthened, then sketch a possible reply.

Moral philosophers agree that welfare matters. But they disagree about what it is, or how much it matters. In this vital new work, Wayne Sumner presents an original theory of welfare, investigating its nature and discussing its importance. He considers and rejects all notable theories of welfare, both objective and subjective, including hedonism and theories founded on desire or preference. His own theory connects welfare closely with happiness or life satisfaction. Reacting against the value pluralism that currently dominates moral philosophy, (...) he advances welfare as the only basic ethical value. He concludes by discussing the implications of this thesis for ethical and political theory. Written in clear, non-technical language, and including a definitive survey of other work in this area, Sumner's book is essential reading for moral philosophers, political theorists, and welfare economists. (shrink)

What does the idea of taking 'the point of view of the universe' tell us about ethics? Lazari-Radek and Singer defend objectivism in ethics, and hedonistic utilitarianism, following Henry Sidgwick's lead. They explore how to justify an ethical theory; conflicts of self-interest and universal benevolence; and whether we should discount the future.

Acting Now to End World Poverty Peter Singer. were our own, and we cannot deny that the suffering and death are bad. The second premise is also very difficult to reject, because it leaves us some wiggle room when it comes to situations in.

The human brain has some capabilities that the brains of other animals lack. It is to these distinctive capabilities that our species owes its dominant position. Other animals have stronger muscles or sharper claws, but we have cleverer brains. If machine brains one day come to surpass human brains in general intelligence, then this new superintelligence could become very powerful. As the fate of the gorillas now depends more on us humans than on the gorillas themselves, so the fate of (...) our species then would come to depend on the actions of the machine superintelligence. But we have one advantage: we get to make the first move. Will it be possible to construct a seed AI or otherwise to engineer initial conditions so as to make an intelligence explosion survivable? How could one achieve a controlled detonation? To get closer to an answer to this question, we must make our way through a fascinating landscape of topics and considerations. Read the book and learn about oracles, genies, singletons; about boxing methods, tripwires, and mind crime; about humanity's cosmic endowment and differential technological development; indirect normativity, instrumental convergence, whole brain emulation and technology couplings; Malthusian economics and dystopian evolution; artificial intelligence, and biological cognitive enhancement, and collective intelligence. (shrink)

Some puzzles about happiness -- Pt. I. Some things that happiness isn't. Sensory hedonism about happiness -- Kahneman's "objective happiness" -- Subjective local preferentism about happiness -- Whole life satisfaction concepts of happiness -- Pt. II. What happiness is. What is this thing called happiness? -- Attitudinal hedonism about happiness -- Eudaimonism -- The problem of inauthentic happiness -- Disgusting happiness -- Our authority over our own happiness -- Pt. III. Implications for the empirical study of happiness. Measuring happiness -- (...) Empirical research; philosophical conclusions -- The central points of the project as a whole. (shrink)

Anthropology, History, and Education contains all of Kant's major writings on human nature. Some of these works, which were published over a thirty-nine year period between 1764 and 1803, have never before been translated into English. Kant's question 'What is the human being?' is approached indirectly in his famous works on metaphysics, epistemology, moral and legal philosophy, aesthetics and the philosophy of religion, but it is approached directly in his extensive but less well-known writings on physical and cultural anthropology, the (...) philosophy of history, and education which are gathered in the present volume. Kant repeatedly claimed that the question 'What is the human being?' should be philosophy's most fundamental concern, and Anthropology, History, and Education can be seen as effectively presenting his philosophy as a whole in a popular guise. (shrink)

Much public policy analysis requires us to place a monetary value on the bad- ness of a premature human death. Currently dominant approaches to determining this ‘value of a life’ focus exclusively on the ‘self-regarding’ value of life — that is, the value of a person’s life to the person whose death is in question — and altogether ignore effects on other people. This procedure would be justified if, as seems intuitively plausible, other-regarding effects were negligible in comparison with self-regarding (...) ones. I argue that in the light of the issue of overpopulation, that intuitively plausible condition is at best highly questionable. Unless the world is in fact underpopulated, the social disvalue of a premature death is likely to be significantly lower than the current estimates. (shrink)

There is a growing consensus that factory farming of animals — also known as CAFOs, or concentrated animal feeding operations — is morally wrong. The American animal rights movement, which in its early years focused largely on the use of animals in research, now has come to see that factory farming represents by far the greater abuse of animals. The numbers speak for themselves. In the United States somewhere between 20 million and 40 million birds and mammals are killed for (...) research every year. That might seem like a lot — and it far exceeds the number of animals killed for their fur, let alone the relatively tiny number used in circuses — but 40 million represents less than two days’ toll in America’s slaughterhouses, which kill about 10 billion animals each year. (shrink)

We model happiness as a measurement tool used to rank alternative actions. Evolution favors a happiness function that measures the individual’s success in relative terms. The optimal function, in particular, is based on a time-varying reference point –or performance benchmark –that is updated over time in a statistically optimal way in order to match the individual’s potential. Habits and peer comparisons arise as special cases of such updating process. This updating also results in a volatile level of happiness that continuously (...) reverts to its long-term mean. Throughout, we draw a parallel with a problem of optimal incentives, which allows us to apply statistical insights from agency theory to the study of happiness. (shrink)