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Utilitarianism is a version of consequentialism, which states that the consequences of any action are the only standard of right and wrong. Unlike other forms of consequentialism, such as egoism and altruism, egalitarian utilitarianism considers either the interests of all humanity or all sentient beings equally.
One way to divide various consequentialisms is by the types of consequences that are taken to matter most, that is, which consequences count as good states of affairs. According to utilitarianism, a good action is one that results in an increase in pleasure, and the best action is one that results in the most pleasure for the greatest number.
Act utilitarianism is a utilitarian theory of ethics that states that a person's act is morally right if and only if it produces the best possible results in that specific situation. Classical utilitarians, including Jeremy Bentham , John Stuart Mill , and Henry Sidgwick , define happiness as pleasure and the absence of pain.
In contrast, act utilitarians judge an act in terms of the consequences of that act alone (such as stopping at a red light), rather than judging whether it faithfully adhered to the rule of which it was an instance (such as, "always stop at red lights"). Rule utilitarians argue that following rules that tend to lead to the greatest good will ...
The Utilitarian philosopher John Stuart Mill criticizes Kant for not realizing that moral laws are justified by a moral intuition based on utilitarian principles (that the greatest good for the greatest number ought to be sought). Mill argued that Kant's ethics could not explain why certain actions are wrong without appealing to utilitarianism ...
Two-level utilitarianism is virtually a synthesis of the opposing doctrines of act utilitarianism and rule utilitarianism. Act utilitarianism states that in all cases the morally right action is the one which produces the most well-being, whereas rule utilitarianism states that the morally right action is the one that is in accordance with a ...
Philosophers have sought to eliminate these contradictions by locating right and wrong in a single part of the decision-making process: for example, in the actions we take (e.g. Kant), in our character (e.g. Aristotle, virtue ethics) or in the consequences of our actions (e.g. Utilitarianism).
In social choice and operations research, the utilitarian rule (also called the max-sum rule) is a rule saying that, among all possible alternatives, society should pick the alternative which maximizes the sum of the utilities of all individuals in society.