The Repugnant Conclusion served an important purpose in catalyzing and inspiring the pioneering stage of population ethics research. We believe, however, that the Repugnant Conclusion now receives too much focus. Avoiding the Repugnant Conclusion should no longer be the central goal driving population ethics research, despite its importance to the fundamental accomplishments of the existing literature.

Parfit's requirements for an ideal Theory X cannot be fully met since the Mere Addition Principle and Non-Antiegalitarianism imply the Repugnant Conclusion: Theory X does not exist. However, since the Repugnant Conclusion is really compelling, the Impersonal Total Principle should be adopted for impartial comparisons concerning future generations. Nevertheless, where our own interests are affected, we may yet choose to be partial, trading off our concern for future goodness with our self-interests. Theory X' meets all Parfit's requirements except the Mere (...) Addition Principle in less compelling cases. (shrink)

Welfare biology is the study of living things and their environment with respect to their welfare. Despite difficulties of ascertaining and measuring welfare and relevancy to normative issues, welfare biology is a positive science. Evolutionary economics and population dynamics are used to help answer basic questions in welfare biology : Which species are affective sentients capable of welfare? Do they enjoy positive or negative welfare? Can their welfare be dramatically increased? Under plausible axioms, all conscious species are plastic and all (...) plastic species are conscious. More complex niches favour the evolution of more rational species. Evolutionary economics also supports the common-sense view that individual sentients failing to survive to mate suffer negative welfare. A kind of God-made fairness between species is also unexpectedly found. The contrast between growth maximization, average welfare, and total welfare maximization is discussed. It is shown that welfare could be increased without even sacrificing numbers. Since the long-term reduction in animal suffering depends on scientific advances, strict restrictions on animal experimentation may be counter-productive to animal welfare. (shrink)

Ng :255–285, 1995. https://doi.org/10.1007/bf00852469) models the evolutionary dynamics underlying the existence of suffering and enjoyment and concludes that there is likely to be more suffering than enjoyment in nature. In this paper, we find an error in Ng’s model that, when fixed, negates the original conclusion. Instead, the model offers only ambiguity as to whether suffering or enjoyment predominates in nature. We illustrate the dynamics around suffering and enjoyment with the most plausible parameters. In our illustration, we find surprising results: (...) the rate of failure to reproduce can improve or worsen average welfare depending on other characteristics of a species. Our illustration suggests that for organisms with more intense conscious experiences, the balance of enjoyment and suffering may lean more toward suffering. We offer some suggestions for empirical study of wild animal welfare. We conclude by noting that recent writings on wild animal welfare should be revised based on this correction to have a somewhat less pessimistic view of nature. (shrink)

Utilitarianism seems to be going out of fashion, amidst increasing concerns for issues of freedom, equality, and justice. At least, anti-utilitarian and non-utilitarian moral philosophers have been very active. This paper is a very modest attempt to defend utilitarianism in particular and welfarism in general. Section I provides an axiomatic defence of welfarism and utilitarianism. Section II discusses the divergences between individual preferences and individual welfares and argues in favour of welfare utilitarianism. Section III criticizes some non-utilitarian principles, including knowledge (...) as intrinsically good, rights-based ethics, and Rawls's second principle. Section IV argues that most objections to welfarism are probably based on the confusion of non-ultimate considerations with basic values. This is discussed with reference to some recent philosophical writings which abound with such confusion. Section V argues that the acceptance of utilitarianism may be facilitated by the distinction between ideal morality and self-interest which also resolves the dilemma of average versus total utility maximization in optimal population theory. (shrink)

The possibility of AI consciousness depends much on the correct answer to the mind–body problem: how our materialistic brain generates subjective consciousness? If a materialistic answer is valid, machine consciousness must be possible, at least in principle, though the actual instantiation of consciousness may still take a very long time. If a non-materialistic one is valid, machine consciousness is much less likely, perhaps impossible, as some mental element may also be required. Some recent advances in neurology and many results of (...) parapsychology suggestive of survival after our biological death, strongly support the non-materialistic position and hence the much lower likelihood of AI consciousness. Instead of being concern about AI turning conscious and machine ethics, and trying to instantiate AI consciousness soon, we should perhaps focus more on making AI less costly and more useful to society. (shrink)

Many utilitarians accept Bentham's view that to argue for the principle of utility is as ‘impossible as it is needless'. They take utilitarianism as a first principle which one either accepts or does not. They do, of course, defend utilitarianism against objections, and make objections to other ethical positions; but the principle of utility itself, they hold, must stand on its own merits. In this article we use a different approach. We introduce a principle, which we call ‘Weak Majority Preference', (...) which we believe likely to be accepted by many who do not consider themselves utilitarians. We then show that from this principle it is possible to derive the general principle of utility. (shrink)

After reviewing the compelling case for separability (`social welfare is a separable function of individual utilities'), an argument is advanced for utilitarianism (defined as `social welfare is the unweighted sum of individual utilities'). Basically, a compelling individualism-type axiom leads us to (social welfare as an) unweighted sum (of individual utilities), given separability.

Considering efficiency, equality, and morality, this book argues for qualified market expansion, particularly in legalizing kidney sales and prostitution. Legalizing prostitution will benefit both men and women, as argued in a chapter jointly written with Yan Wang. Blood donation without monetary compensation can still result in adequate blood supply if schools educate children that blood donation can actually benefit a donor's health. As a society becomes more advanced, with higher incomes and a better educated populace, more activities can be subject (...) to market exchange, with gradual popular acceptance. Without serious misinformation and irrationality, inequality/fairness as such cannot be a valid reason for limiting the scope of the market. The book supports the use of markets to increase efficiency while also increasing the effort to promote equality, making all income groups better off. (shrink)

Intergenerational impartiality requires putting the welfare of future generations at par with that of our own. However, rational choice requires weighting all welfare values by the respective probabilities of realization. As the risk of non-survival of mankind is strictly positive for all time periods and as the probability of non-survival is cumulative, the probability weights operate like discount factors, though justified on a morally justifiable and completely different ground. Impartial intertemporal welfare maximization is acceptable, though the welfare of people in (...) the very far future has lower effects as the probabilities of their existence are also lower. However, the effective discount rate on future welfare values (distinct from monetary values) justified on this ground is likely to be less than 0.1 per annum. Such discounting does not compromise environmental protection and sustainability unduly. The finiteness of our universe implies that the sum of our expected welfare to infinity remains finite, solving the paradox of having to compare different infinite values in optimal growth/conservation theories. (shrink)

Ng and singer derive the principle of utility from the fact of finite sensibility and another principle, weak majority preference: "for a community of n individuals choosing between two possibilities, x and y, if no individual prefers y to x, and at least n/2 individuals prefer x to y, then x increases social welfare and is preferable." this derivation is regarded as incorrect in a comment. this reply explains why the derivation is valid and shows that the comment is based (...) on confusing a general social ordering with a utilitarian one. (shrink)