Utility monster
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The Utility monster is a thought experiment in the study of ethics. It was created by philosopher Robert Nozick as a criticism of utilitarianism.
In the thought experiment, the idea of a monster is proposed, who can turn resources into his own utility far more effectively than anyone else. If one unit of resource brings me one unit of pleasure, one unit of resource brings the utility monster 100 units of pleasure.
If the utility monster can get so much pleasure from each unit of resources, It follows from utilitarianism, that the distribution of resources should acknowledge this. If the utility monster existed, it would justify the mistreatment and perhaps annihilation of everyone else, according to the doctrine utilitarianism.
This thought experiment seems to point out that utilitarianism is not actually egalitarian, even though it appears to be at first glance.