Category: ethics
Associated thinker(s): Robert Nozick
Original publication or approximate period: Anarchy, State, and Utopia (1974)
Difficulty: Intermediate
Themes: aggregation, fairness, welfare
Related experiments: repugnant-conclusion, experience-machine
Kind: thought experiment
Research checked: 2026-11-01
Nozick introduces the possibility of a utility monster: a being that gains enormously more utility from any sacrifice by others than those others lose. He argues that utilitarian theory seems to require sacrificing everyone to the monster in order to increase total utility. This is a hypothetical challenge to a theory, not an empirical claim about a real person or group.
Can maximizing total well-being justify extreme concentration on a single beneficiary?
The case exposes a tension between aggregate benefits and the distribution of those benefits. It also requires careful distinctions between measurable welfare, resources, needs, and moral status. Equal resources and equal welfare are different goals.
As a separate illustration—not Nozick’s example—imagine allocating ten units. A unit gives an ordinary recipient one welfare point but gives the monster one hundred. If the values are comparable and additive, and all other effects are excluded, an unrestricted total-utility rule favors giving the units to the monster. The arithmetic is straightforward; the dispute concerns whether those assumptions are justified and whether the total alone should govern distribution. A theory that weights gains to worse-off people or adds other constraints uses a different objective.
An unrestricted additive total-utility maximizer may accept an unequal distribution if the stipulated utility gains are genuinely comparable and large enough. That conclusion does not follow for every consequentialist theory: some views give weight to distribution, prioritize the worse off, or impose other constraints. The monster’s extraordinary gains are a premise of the hypothetical, not an empirical finding.
The monster is not simply a greedy person who makes extravagant demands. The hypothetical stipulates exceptionally large utility gains; it does not rely on self-reported desire or make an empirical finding about any social group. Denying that such a case is empirically likely does not by itself settle its conceptual implications.
Richard Yetter Chappell’s later “negative utility monster” discussion starts from a being in massive suffering, a variation that changes the case’s starting point. The Cambridge page available here provides its abstract and publication record, not the full article. This variation should not be treated as identical to Nozick’s positive-gain monster.
Nozick’s primary passage is in chapter 3, “Moral Constraints and the State,” p. 41. It supports the hypothetical and his qualified claim that utilitarian theory “seems to require” sacrificing everyone to increase total utility. The Cambridge article was accessed at abstract and bibliographic-record level only. The Stanford Encyclopedia and Internet Encyclopedia are contextual secondary sources: they support distinctions among consequentialist theories and Nozick’s rights-based political philosophy, not the original monster’s wording. The numerical illustration, teaching prompts, and explanatory framing are original editorial material.
Access scope: a selected passage in Nozick’s book was read in a university-hosted PDF reproduction; the complete book was not reviewed. No claim is made that the hypothetical is empirically realized, that the argument succeeds, or that all consequentialists accept its assumptions.