In normative ethics, a tradition stemming from the late 18th- and 19th-century English philosophers and economists Jeremy Bentham and John Stuart Mill that an action is right if it tends to promote happiness and wrong if it tends to produce the reverse of happiness—not just the happiness of the performer of the action but also that of everyone affected by it. Such a theory is in opposition to egoism, the view that a person should pursue his own self-interest, even at the expense of others, and to any ethical theory that regards some acts or types of acts as right or wrong independently of their consequences. Utilitarianism also differs from ethical theories that make the rightness or wrongness of an act dependent upon the motive of the agent; for, according to the Utilitarian, it is possible for the right thing to be done from a bad motive.
"Utilitarianism." Encyclopædia Britannica from Encyclopædia Britannica Online.