Category: society-and-justice
Type: thought experiment
Associated thinker(s): Derek Parfit, Larry Temkin (prominent debate)
Original publication or approximate period: Contemporary equality debate; Parfit’s “Equality and Priority” (1997)
Difficulty: Intermediate
Themes: equality, priority, welfare
Related experiments: The Veil of Ignorance and Original Position; Wilt Chamberlain’s Earnings; Dworkin’s Resource Auction
Imagine two groups with unequal levels of well-being. A proposed change reduces the better-off group to the worse-off group’s level and provides no benefit to anybody. No resources are transferred; no domination is removed; no future advantage results. The outcome is more equal, but some people are worse off and nobody is better off.
The stipulation excluding indirect benefits matters. Real policies that reduce an advantage may improve fair competition, political standing, or public services. Those policies do not automatically satisfy the pure case’s premise that no one benefits.
Is a more equal outcome better in any respect when the only change is making some people worse off?
The case tests whether equality has independent value or whether our concern is better explained by helping people who fare badly. It also separates “better overall” from “better in one respect.” An objection to one judgment need not establish the other, and moral pluralists can assign more than one value to a situation.
Prioritarian response: a benefit matters more when it goes to someone worse off, but harming the better-off helps no one. Priority can explain concern for disadvantage without treating the pure reduction as an improvement.
Pluralist egalitarian response: equality might improve in one respect while the outcome becomes worse overall because losses outweigh that improvement. Critics question whether the purported improvement is intelligible without benefiting anyone.
Relational response: the central ideal may concern equal standing rather than identical welfare levels. Removing oppressive power can matter, but that is not the benefit-free reduction stipulated in the pure objection.
The argument does not refute every egalitarian theory. Equality of status, fair opportunity, and reduction of poverty are different aims. Nor should a tax-funded service be called leveling down simply because someone pays more: recipients may benefit. The thought experiment deliberately removes such effects to isolate a value claim.
Examples using lost sight or destroyed resources sharpen the same structure, but disability should not be treated as a complete measure of a person’s well-being. Prioritarian and relational theories offer distinct alternatives. They should be compared on their own commitments rather than grouped as a single reply.
The retrieved SEP egalitarianism discussion supplies Parfit’s objection and responses; the equality entry supplies wider conceptual context. No claim is made that Parfit invented every earlier concern about reducing advantage. The two-group setup is an editorial restatement.
Research check: 2026-10-30. References above were retrieved for the support described; this is an original educational explanation, not a substitute for the primary texts. Additional speculative comparisons are teaching prompts, not established historical variations.