What Is Effective Altruism?

Direct Answer

Effective altruism (EA) is both a philosophy and a social movement that uses evidence and reason to figure out how to do the most good, and then acts on that evidence. Its core commitments are impartiality — everyone's welfare counts equally, wherever and whenever they live — and effectiveness — good intentions are not enough; we must measure outcomes and compare interventions. EA emerged in the 2000s in the Oxford utilitarian milieu around Toby Ord, William MacAskill, and Peter Singer, and it has since channeled billions of dollars to the most cost-effective charities through GiveWell, to farmed animal welfare, and to the prevention of catastrophic risks, especially from artificial intelligence. The movement is best known for three things: cause prioritization (the systematic comparison of problems by scale, tractability, and neglectedness), the earning-to-give strategy (working in high-paying careers to donate more), and longtermism (the claim that the far future deserves enormous weight in our choices).

Historical Context

The intellectual roots of effective altruism lie in utilitarianism — Bentham, Mill, and especially Henry Sidgwick, whose The Methods of Ethics articulated the impartial standpoint — and in Peter Singer's arguments about global poverty. Singer's "Famine, Affluence, and Morality" (1972) argued that the affluent are obligated to give to the point of marginal utility, and his 2007 talk "The Drowning Child and the Expanding Circle" helped launch the movement. The founding institutions followed: Giving What We Can (2009), where members pledge a percentage of income to the most effective charities; 80,000 Hours, which advises on high-impact careers; and GiveWell, which conducts rigorous cost-effectiveness analysis and publishes its findings. William MacAskill's Doing Good Better (2015) codified the method, and the movement expanded into AI safety and longtermism with the work of Nick Bostrom, Toby Ord, and others. The movement reached public prominence and then crisis with the collapse of FTX in 2022, when its founder Sam Bankman-Fried — a prominent EA donor — was convicted of fraud, prompting a period of self-examination and reform.

Key Issues & Debates

The demandingness question asks how much individuals must sacrifice; Singer's answer — give until further giving harms you more than it helps others — is contested by those who defend a more moderate duty, and the debate connects directly to Shelly Kagan's work on the limits of ordinary morality. Cause prioritization raises hard comparisons: how do we weigh saving a life from malaria against reducing farmed animal suffering or reducing existential risk, when the values are incommensurable? Measurement is its own problem: randomized trials and cost-effectiveness analysis are powerful but imperfect, and some goods resist quantification. The earning-to-give strategy is criticized for legitimizing harmful industries and for creating concentration of power. The structural critique holds that EA focuses on charity rather than political and economic transformation, and that it individualizes responsibility. The FTX scandal intensified these critiques and raised questions about the movement's governance, its tolerance for high-risk actors, and the ethics of philanthropic power itself. Longtermism — the view that the welfare of vast future populations dominates our obligations — is defended by Ord and MacAskill but criticized for discounting present suffering and for justifying extreme risk-taking.

Contemporary Relevance

In 2026, effective altruism has been reshaped by the FTX reckoning: there is renewed emphasis on institutional accountability, community governance, and "neartermist" causes such as global health and animal welfare, while AI safety continues to attract enormous funding as capabilities accelerate. GiveWell continues to direct hundreds of millions of dollars to proven interventions — insecticide-treated bed nets, deworming, cash transfers — and its methods have entered mainstream philanthropy. Governments and foundations increasingly borrow EA's cost-effectiveness tools. The movement's debates — about how to compare suffering across species and time, about the ethics of philanthropy, and about whether charity can substitute for justice — remain live, and its successes and failures are studied as a case study in the practical power of moral philosophy.

Related Concepts

Effective altruism connects to utilitarianism, impartiality, global ethics, global poverty, consequentialism, longtermism, animal welfare, and the demandingness of morality. It draws on the ethics of Singer, Sidgwick, Kagan, and Parfit, and on the empirical science of what works in development, health, and welfare.

Further Learning

• Stanford Encyclopedia of Philosophy, "Effective Altruism" — https://plato.stanford.edu/entries/effective-altruism/
• Stanford Encyclopedia of Philosophy, "Peter Singer" — https://plato.stanford.edu/entries/singer/
• William MacAskill, Doing Good Better (New York: Avery, 2015).