What Is Consequentialism?

Direct Answer

Consequentialism is the moral theory that says the rightness of an action depends entirely on the value of its consequences. More precisely, an action is morally right if and only if its overall consequences are at least as good as those of any available alternative; the right action is the one that produces the best outcome for everyone affected, judged impartially. This single commitment distinguishes consequentialism from deontology, which judges actions by duty, and from virtue ethics, which judges agents by character. Consequentialists disagree among themselves about which consequences are good, but they agree on the structural claim that consequences are all that ultimately matters for rightness.

The most famous consequentialist theory is utilitarianism, which identifies the good with happiness or well-being and tells us to maximize it. But consequentialism is broader than utilitarianism: one could be a consequentialist about freedom, knowledge, or the survival of the species. What makes a view consequentialist is not its theory of value but its claim that outcomes determine rightness.

Historical Context

The idea that outcomes matter morally is ancient, but consequentialism became a systematic theory in the British utilitarian tradition. Jeremy Bentham's An Introduction to the Principles of Morals and Legislation (1789) made the principle of utility the standard of right and wrong, measuring value in terms of pleasure and pain. John Stuart Mill refined the theory in Utilitarianism (1861), arguing that some pleasures are higher in quality than others. Henry Sidgwick's The Methods of Ethics (1874) gave consequentialism its modern, rigorous formulation, introducing the impersonal standpoint that later philosophers called "the point of view of the universe." In the twentieth century, G. E. Moore's ideal utilitarianism, Derek Parfit's Reasons and Persons, and Peter Singer's practical ethics carried the tradition forward.

Key Arguments & Debates

Consequentialism is defended by two powerful arguments. The first is that morality is about making the world better: if an action would leave everyone better off, refusing to do it looks arbitrary and self-indulgent. The second is impartiality: because each person matters equally, outcomes should be aggregated across all affected individuals, and the best aggregate should win.

The objections are equally powerful. One is the rights objection: consequentialism seems to imply that we may torture, lie to, or kill an innocent person if doing so maximizes aggregate welfare, which violates our deepest intuitions about individual rights. The famous trolley problem dramatizes this tension. A second objection is demandingness: if we are obligated to maximize good outcomes, we must sacrifice most of our resources to help strangers, leaving nothing for our own projects. A third is the objection from integrity, pressed by Bernard Williams, that consequentialism alienates agents from their deepest commitments. A fourth concerns the difference between act and rule versions: act consequentialism seems to license exceptions to useful rules, while rule consequentialism struggles to explain why we should follow a rule when breaking it would do more good.

Contemporary Relevance

Consequentialist reasoning dominates modern policy and practice. Cost-benefit analysis, pandemic triage, climate mitigation, and the effective altruism movement all operate on the premise that resources should go where they do the most good. The ethics of artificial intelligence is largely a debate about how to specify an objective function that machines should maximize, which is a consequentialist design problem. Meanwhile the theory's critics shape fields from human rights law to bioethics. Whether it is embraced, qualified, or rejected, consequentialism is the theory that contemporary moral philosophy defines itself against, which makes understanding it essential.

Related Concepts

Consequentialism is best understood in contrast to deontological ethics, which denies that outcomes settle rightness, and to virtue ethics, which centers character. Within the family, explore utilitarianism, the principle of utility, and the act vs rule distinction. The philosophical home of the theory is the consequentialism page, and its founder's biography is on the Jeremy Bentham page.

Further Learning

For authoritative surveys, see the Stanford Encyclopedia of Philosophy entries on Consequentialism and Rule Consequentialism, and the Internet Encyclopedia of Philosophy entry on Consequentialism.