Effective altruism

Effective altruism asks how individuals and institutions can use limited resources to produce the greatest positive impact. Its advocates typically combine moral concern for people and animals with empirical investigation of which interventions work, how much they cost, and where additional resources are most useful.¹ The approach is not a single ethical theory: consequentialists, deontologists, virtue ethicists, and people with more pluralistic views have all participated in it.

Three practical questions recur. Scale concerns how many lives or how much welfare an intervention could affect; tractability asks whether additional resources can materially improve the problem; and neglectedness asks whether other donors or institutions are already addressing it. These criteria are heuristics rather than a mechanical formula. They are often paired with cost-effectiveness analysis, uncertainty estimates, and attention to unintended consequences.

Effective altruism has developed institutions for evaluating donations, careers, and research priorities. GiveWell investigates global-health charities, with particular attention to evidence, transparency, room for more funding, and the marginal effect of an additional donation.² Giving What We Can encourages people to make substantial, publicly or privately recorded giving commitments, while 80,000 Hours applies related reasoning to career choice and professional skills.³⁴

Commonly discussed interventions include malaria prevention, treatment of neglected tropical diseases, and other global-health programs, although recommendations change as evidence and funding conditions change. The movement has also supported animal-welfare work, biosecurity, artificial-intelligence safety, and scientific research. These areas differ greatly in evidential maturity: a bed-net campaign may have comparatively direct outcome data, whereas policy or technical research often involves longer causal chains and wider uncertainty.

Effective altruism grew out of Oxford-based philosophical and charitable networks in the 2000s and early 2010s, including the work of philosophers Toby Ord and William MacAskill. Giving What We Can was founded in 2009, and the label “effective altruism” became widely used during the following decade.¹³

Critics question whether interpersonal welfare can be compared reliably, whether estimated cost-effectiveness is too sensitive to uncertain assumptions, and whether focusing on measurable outcomes undervalues justice, solidarity, local knowledge, or political change. Others argue that high-income donors should address structural causes rather than rely primarily on individual donations. The movement’s attention to long-term future risks has also prompted debate about speculative probabilities, democratic accountability, and the possibility that future-oriented reasoning could divert resources from present suffering. Supporters generally answer that uncertainty should be modeled explicitly, not ignored, and that different cause areas should be assessed with different standards of evidence.

Effective altruism includes more than a list of recommended charities. Its “earning to give” idea proposes that some people may have greater impact by pursuing a well-paid career and donating substantially, while others may contribute more directly through research, organizing, public service, or technical work.⁴ The movement also distinguishes between cause prioritization, which compares broad problem areas, and intervention evaluation, which compares specific ways of acting within one area.

Several less visible practices shape its reasoning. Donor-advised funds and regranting organizations can preserve flexibility when promising opportunities are not yet ready for funding. “Room for more funding” is treated as a changing condition rather than a permanent property of a charity. Effective-altruist organizations also use randomized trials, systematic reviews, expert forecasting, and cost-effectiveness models, but these tools do not eliminate value judgments. In practice, the movement contains a spectrum from near-term global health to animal welfare and longtermist work on risks to future generations.

Cost-effectiveness

The amount of beneficial outcome produced per unit of money, time, or another resource.

Neglectedness

The extent to which a problem receives fewer resources than its scale or importance might warrant.

Tractability

The degree to which additional effort is likely to make meaningful progress on a problem.

Longtermism

The view that positively affecting the long-run future is a major moral priority.

Room for more funding

The amount of additional money an organization or intervention can usefully absorb while maintaining strong expected impact.