第 1 章
The Power to Transform Lives: How Effective Altruism Is Changing Philanthropy
When Trevor Field encountered a children's merry-go-round that pumped clean water at a South African agricultural fair in 1989, he thought he'd found the perfect solution to a problem he'd witnessed years earlier-women waiting hours by windmill pumps for water. His PlayPump invention seemed ingenious: children play, water flows, and communities thrive. The concept attracted massive support, including endorsements from Jay-Z and Bill Clinton, plus a $16.4 million grant from Laura Bush. By 2009, PlayPumps International had installed 1,800 pumps across southern Africa. Then came the devastating reality check: the pumps required exhausting effort from children who quickly tired, often leaving women to push the merry-go-rounds themselves; they delivered less water than traditional pumps while costing four times more; and they frequently broke down without maintenance support. The organization's American branch shut down, acknowledging failure.
Meanwhile, researchers Michael Kremer and Rachel Glennerster took a different approach to improving lives. After witnessing failed development projects in Kenya, they pioneered randomized controlled trials in development economics. Their rigorous testing revealed that simple deworming programs reduced school absenteeism by 25% at just five cents per additional day of school attendance. Ten years later, dewormed children worked more hours and earned 20% higher incomes. This research led to the Deworm the World Initiative, which has provided over forty million treatments.
The contrast between these approaches illustrates the core principle of William MacAskill's "Doing Good Better": compassion must be guided by evidence and reason to truly help others. Good intentions aren't enough-we need to know what actually works.
第 2 章
The Extraordinary Power of the Global 1%
While Americans often think of the "1%" as the ultra-wealthy in their own country, the global perspective is far more striking. Earning just $52,000 annually places you in the richest 1% globally, while even $28,000 (typical for American workers) puts you in the top 5% worldwide. Most Americans below the poverty line ($11,000) are still richer than 85% of humanity. This stark reality becomes even more apparent when considering that nearly half the world's population lives on less than $5.50 per day, and approximately 700 million people survive on less than $1.90 daily.
This vast inequality creates what MacAskill calls the "100x Multiplier"-the opportunity for those in wealthy countries to do at least one hundred times more good for others than for themselves. Economic research shows that doubling someone's income produces roughly the same happiness increase regardless of starting point, meaning $220 to someone in extreme poverty creates the same benefit as $28,000 to a typical American. For example, a $1,000 donation could provide basic necessities for multiple families in developing nations for an entire year, while the same amount might cover just one month's rent in a major U.S. city.
We live in an unusual historical moment of remarkable but unequal economic progress. Global extreme poverty has fallen from 94% in 1820 to under 10% today, yet the gap between rich and poor nations has widened dramatically. In 1820, the average person in the wealthiest countries was perhaps 5 times richer than someone in the poorest countries; today, that ratio can exceed 100 to 1. This disparity is particularly evident in healthcare spending, where annual per capita expenditure ranges from over $10,000 in developed nations to less than $100 in many developing countries.
This creates unprecedented power for those in wealthy countries to help others thousands of miles away through thoughtful charitable giving, career choices, and consumer decisions. For instance, the cost of treating neglected tropical diseases often amounts to just a few dollars per person, while providing basic education in developing countries might cost $150 annually per student. Even modest donations from middle-class individuals in wealthy nations can fund life-changing interventions, such as antimalarial bed nets, vaccinations, or micronutrient supplementation, potentially saving or dramatically improving multiple lives.
The digital revolution and modern banking systems have made it easier than ever to direct resources to effective charities worldwide, amplifying the potential impact of individual giving. Organizations using evidence-based approaches can now deliver aid more efficiently than ever before, often achieving remarkable results for relatively small investments.
第 3 章
Hard Trade-offs: The First Question of Effective Altruism
During Rwanda's horrific 1994 genocide, doctor James Orbinski faced impossible choices at a Red Cross hospital overwhelmed with casualties. He implemented a triage system-marking patients with numbers indicating treatment priority. This stark prioritization, though heartbreaking, saved many lives that would have been lost without such calculated decision-making.
MacAskill argues our charitable choices mirror Orbinski's dilemma: when we donate to one cause, we necessarily forgo helping another. Though less visible than a battlefield hospital, our choices have real consequences for real people. Effective altruism confronts this reality by asking its first key question: "How many people benefit, and by how much?"
Yet many charities don't provide clear information about what donations actually accomplish, making informed choices difficult. MacAskill compares this to a grocery store without prices, where you simply hand over money without knowing what you'll receive-an absurd arrangement we nonetheless accept in charitable giving.
To meaningfully compare different interventions, economists developed the quality-adjusted life year (QALY), combining two key benefits: extending life and improving life quality. Using survey data about how people rate different health conditions, QALYs allow us to compare diverse interventions. For example, preventing blindness in a twenty-year-old (30 QALYs) provides greater benefit than antiretroviral therapy for a forty-year-old with AIDS (6.5 QALYs).
MacAskill rejects the "charitable imperialism" critique that comparing different causes is inappropriate, noting that without comparisons, we couldn't prioritize saving lives over minor benefits. While personal connections to causes are understandable, choosing causes based solely on personal experience arbitrarily privileges some people's needs over others we could help more effectively.
第 4 章
How You Can Save Hundreds of Lives: Finding the Most Effective Interventions
Aid skeptics like Dambisa Moyo and William Easterly argue that trillions in aid spending has achieved little. However, MacAskill reveals two critical flaws in their reasoning: First, $1 trillion over sixty years amounts to just $40 per recipient annually-a tiny sum. Second, quality of life has dramatically improved, with life expectancy in sub-Saharan Africa rising from 36.7 to 56 years.
The eradication of smallpox alone-saving 60-120 million lives-justifies all aid spending, costing just $40,000 per life saved compared to the $7 million U.S. agencies typically spend to save a life. Even aid critics acknowledge successes in global health interventions like eliminating smallpox and reducing deaths from preventable diseases.
The key insight is that aid effectiveness follows a "fat-tailed distribution" where the best programs dramatically outperform typical ones. For example, deworming programs produce 139 additional years of schooling per $1,000 spent-fifteen times better than providing school uniforms. Similarly, in health, promoting condom use provides 100 times more benefit than treating Kaposi's sarcoma, while malaria prevention through bed nets delivers 500 times more benefit.
This demonstrates why we shouldn't just ask if a program is good, but whether it's the best possible use of resources. Even with imperfect estimates, the dramatic differences in effectiveness mean we should focus on the most effective programs, enabling us to save dozens of lives throughout our careers for around $3,400 per life saved.
第 5 章
The Neglected Factor: Finding Opportunities Others Miss
The principle of diminishing returns reveals extraordinary opportunities to help others by focusing on neglected areas. While it costs $50,000 to train one guide dog for a blind person in wealthy countries, the same amount could cure 500 people of blindness from trachoma in developing countries. Similar disparities exist in healthcare funding-cancer receives $217 billion annually while malaria gets only $1.6 billion, despite malaria causing about half as much global suffering as cancer.
This funding imbalance exists because rich countries have already eliminated malaria (the US did so by 1951), making additional funding for malaria prevention extraordinarily effective. While US health programs consider spending $50,000 per QALY reasonable, the same benefit can be achieved in poor countries for just $100-a 500x multiplier in effectiveness.
The principle applies to careers too. Medical student Greg Lewis discovered that while doctors in the US appear to save many lives, the marginal value of one additional doctor is much smaller than intuition suggests. By analyzing statistics across countries, Greg calculated that adding one doctor to the US healthcare system provides only about 4 QALYs per year (roughly equivalent to saving 4 lives over a 40-year career). However, that same doctor working in Ethiopia could provide 300 QALYs per year-a 100x difference in impact.
This demonstrates why focusing on neglected areas allows for much greater impact than working in popular, well-resourced fields. The third key question of effective altruism asks: "Is this area neglected?"
第 6 章
The Counterfactual: What Would Have Happened Otherwise?
What truly matters isn't who gets credit for good deeds but the difference between what happens because of your actions versus what would have happened anyway-the counterfactual. MacAskill illustrates this with an analogy of performing CPR on a heart attack victim: if you're the only person available, you're a hero even if your technique is imperfect, but if you push aside a trained paramedic to perform worse CPR, you've actually caused harm despite "saving a life." This principle extends beyond emergency situations to virtually every charitable intervention we consider.
This counterfactual thinking-the fourth key question of effective altruism-is essential but often neglected in charitable work, sometimes with disastrous consequences. Programs like Scared Straight, which aimed to deter juvenile delinquency by exposing at-risk youth to prison conditions, actually increased crime rates by 28%. Similarly, Play Pumps replaced functioning hand pumps in African villages with playground equipment that doubled as water pumps. While well-intentioned, this intervention actually made water access more difficult and less reliable for many communities, as the new system required children to play constantly to pump water and was harder to maintain than traditional hand pumps.
Other examples of failed interventions due to poor counterfactual analysis include donation programs that flood local markets with free goods, undermining local businesses and economic development. For instance, clothing donations to East African countries have severely impacted local textile industries, potentially causing more long-term harm than good. These cases highlight the importance of considering not just the direct effects of an intervention, but also its ripple effects throughout the system.
Counterfactual reasoning also applies to career choices. While doctors in rich countries save lives, the counterfactual impact of becoming one more doctor in an already well-served area is relatively small. If you hadn't become a doctor, someone else nearly as qualified would have taken your place. This "replaceability" factor suggests that working in neglected areas or innovative fields often creates more counterfactual impact. For example, becoming a researcher in neglected tropical diseases or working on AI safety might have a greater marginal impact than joining an already saturated field.
The concept extends to personal giving as well. When considering where to donate, we should ask not just "What will my donation achieve?" but "What will my donation achieve that wouldn't have happened otherwise?" This might mean supporting newer or underfunded organizations where each dollar has a larger marginal impact, rather than well-established charities that would likely receive adequate funding regardless of our individual contributions.
第 7 章
Expected Value: Making Decisions Under Uncertainty
MacAskill argues that many ethical ideas now considered common sense-like equal rights for women, Black people, and LGBTQ individuals-were once dismissed as radical. The abolition of slavery faced objections about compensating slave owners and preserving "American values," yet these arguments are now recognized as indefensible. Activists were right to pursue these causes despite low short-term odds because the potential benefit was so great.
The fifth key question of effective altruism asks: "What are the chances of success, and how good would success be?" This expected value approach multiplies the probability of success by the magnitude of impact. Even low-probability actions can be worth taking if the potential impact is enormous.
This reasoning applies to climate change in three ways. First, even if climate change weren't certain (though 97.1% of scientific papers endorse human-caused warming), the mere possibility warrants action-just as you'd respond to a carbon monoxide alarm with a 20% accuracy rate because the potential harm outweighs inconvenience. Second, individual actions matter despite seemingly negligible effects-your lifetime emissions increase global temperature by only half a billionth of a degree, but occasionally this will trigger disasters, making the expected harm significant. Third, standard economic analyses underestimate climate change's impact by focusing on likely scenarios (2-4C warming) while ignoring the small but catastrophic risk of 10C+ warming that could cause civilizational collapse.
Expected value reasoning applies even to seemingly "unquantifiable" areas like political change and disaster prevention-we must assess chances of success and potential impact rather than randomly choosing causes or doing nothing.
第 8 章
Finding the Most Effective Charities: Beyond Overhead Costs
When evaluating charities, many people focus on overhead costs or emotional appeal, but these metrics tell us little about actual impact. Instead, MacAskill recommends focusing on evidence quality, implementation capability, and room for additional funding.
The most reliable evidence comes from academic studies, meta-analyses, and independently audited randomized controlled trials. This is crucial because many seemingly effective programs fail when rigorously tested. For example, microcredit initially seemed promising based on anecdotes, but high-quality studies revealed it has minimal impact on income, consumption, health, or education-loans are typically used for consumption rather than business creation, and high interest rates can trap borrowers in debt.
When comparing organizations like GiveDirectly (which provides direct cash transfers to poor households) and Development Media International (which produces radio shows educating people on basic health matters), we must consider the strength of evidence supporting each approach. Cash transfers have been extensively studied across many countries with consistent positive results, while DMI's evidence, though promising, is less comprehensive.
Both organizations excel in implementation quality. GiveDirectly is led by a leading development economist while DMI is led by someone with extensive radio education experience and advised by top epidemiologists and economists. Both demonstrate remarkable transparency, with GiveDirectly even reporting the percentage of recipients who paid bribes to local agents (0.4%).
After extensive analysis, MacAskill recommends several top charities:
1. Against Malaria Foundation provides insecticide-treated bed nets at about $100 per QALY
2. Schistosomiasis Control Initiative funds deworming programs at less than $1 per child treated annually
3. Deworm the World Initiative provides technical assistance to government deworming programs at about 3 cents per child treated
4. GiveDirectly delivers cash transfers with 90 cents of every dollar reaching recipients
5. Development Media International produces health education radio shows at approximately $10 per QALY
6. Living Goods operates community health promoter networks at $3,000-$11,000 per life saved
7. The Iodine Global Network advocates for iodine fortification programs with estimated returns of $27 for every dollar spent
第 9 章
Ethical Consumption: The Surprising Case for Sweatshops
MacAskill builds a counterintuitive case that sweatshops represent a crucial developmental stepping stone by citing economists across the political spectrum. Jeffrey Sachs argues "My concern is not that there are too many sweatshops but that there are too few," while evidence shows low-wage manufacturing helps economies evolve from agricultural to industrial societies. The Industrial Revolution took over a century in Europe and America, while modern "Tiger economies" like Hong Kong and Singapore transformed much more rapidly using this development path.
When we boycott sweatshops, we often harm those we intend to help. The 1993 Child Labor Deterrence Act illustrates this danger-when Bangladesh factories preemptively laid off 50,000 child workers, many ended up in street hustling and prostitution according to UNICEF. The solution isn't boycotting sweatshop goods but addressing the extreme poverty that makes sweatshops desirable workplaces.
Even "ethical consumption" alternatives like fair-trade products deliver disappointingly little benefit. Fair-trade certification typically helps farmers in relatively richer countries like Mexico and Costa Rica rather than the poorest nations like Ethiopia. Of the premium paid for fair-trade products, studies show only 1-11% reaches producers in poor countries. Professor Cramer's four-year study found fair-trade workers in Ethiopia and Uganda often had lower wages than non-fair-trade workers.
For environmentally conscious consumers, many popular "green" actions have minimal impact. Unplugging electronics saves less carbon than one hot bath, turning off lights affects only 3% of household energy use, and eliminating plastic bags cuts just 0.4% of personal emissions. Even "buying local" is overrated-production accounts for 80% of food's carbon footprint versus just 10% from transportation.
Carbon offsetting offers a more effective approach. After evaluating over 100 organizations, Giving What We Can identified Cool Earth as the most cost-effective option. Rather than directly buying rainforest, Cool Earth helps forest communities develop economic alternatives to selling land to loggers. At just thirty-eight cents to prevent one metric ton of CO2 emissions, it provides a remarkably efficient way to address climate impact.
第 10 章
Career Choices: Beyond "Following Your Passion"
MacAskill outlines three key factors for career evaluation: personal fit, immediate impact, and long-term potential.
Personal fit isn't about following passion-that's terrible advice. Research shows 84% of students' passions (mostly sports, music, art) match only 3% of available jobs. Additionally, our interests change dramatically over time, making passion an unreliable guide.
Instead, job satisfaction depends on five features of work itself: independence (control over your work), sense of completion (seeing your contribution), variety (using different skills), feedback (knowing how you're performing), and contribution (positive impact on others). These factors predict satisfaction, motivation, and productivity far better than passion does.
For immediate impact, MacAskill cautions against assuming charity work automatically creates change. Impact depends on the organization's effectiveness, your added value beyond replacement candidates, and considering multiple impact routes (direct labor, donations, and influence). The effectiveness of causes you support through your labor, donations, or influence greatly determines your impact.
Most importantly, when starting out, focus on building skills and credentials rather than immediate impact. Getting advanced degrees, learning to program, or building networks can dramatically increase your future influence. The most senior people have disproportionate impact, so maximizing your chances of reaching influential positions is crucial.
For long-term impact, develop "career capital"-skills, networks, and credentials. Keep options open (it's easier to move from for-profit to nonprofit than vice versa) and seek "exploration value"-learning what careers suit you best. Rather than seeing career choice as a one-off decision, approach it like an entrepreneur testing hypotheses: maintain a flexible career "model," identify and reduce key uncertainties, and test yourself in different paths.
MacAskill outlines promising career strategies divided into "solid bets" with reliable positive impact and "high-potential long shots" with smaller chances of enormous impact. Direct work for highly effective organizations makes sense when the organization is particularly effective, you'll learn significantly, they need talent more than money, and you're certain about long-term nonprofit work. Earning to give allows immediate significant impact by supporting cost-effective organizations while building valuable skills. Politics and advocacy offer small chances of extremely large influence, following winner-takes-all dynamics with highly fat-tailed distributions of impact.
第 11 章
Choosing Causes: Scale, Tractability, and Neglectedness
When comparing causes, we need to consider three key dimensions: scale, tractability, and neglectedness. Scale measures a problem's size in terms of impact on well-being. All else equal, larger problems deserve higher priority because many activities have proportional impact and larger problems take longer to resolve. Tractability refers to our ability to convert resources into progress on the problem. Even huge, neglected problems like aging may not be worth addressing if solutions seem unattainable. Neglectedness measures resources invested relative to scale, with less-addressed problems typically offering more cost-effective opportunities due to diminishing returns.
Using this framework, MacAskill evaluates several major cause areas:
US criminal justice reform has fairly large scale (benefiting over 200,000 people annually who wouldn't face imprisonment), is fairly neglected (only about $20 million spent annually by non-governmental organizations), and is extremely tractable (bipartisan support exists due to declining crime rates and economic pressures).
International labor mobility has very large scale (potentially increasing global GDP by more than 50% with free labor mobility) and is very neglected (few organizations focus on benefits to potential migrants), but isn't very tractable politically (increased immigration is deeply unpopular in developed countries).
Factory farming affects fifty billion animals annually, making its scale potentially very large depending on how much moral weight you place on animal suffering. It's extremely neglected (nonprofits spending less than $20 million yearly) and fairly tractable (meat consumption is decreasing, and there are reliable methods to promote vegetarianism).
Climate change (2-4C) will likely cause economic damage, deaths, and biodiversity loss. It receives significant attention ($8 billion annually from the US government plus hundreds of millions from foundations). Individual action is fairly tractable through emissions reduction, though political progress has been slow.
Catastrophic climate change (10C+) represents a low-probability but extremely high-impact risk. Unlike regular climate change mitigation, research into catastrophic scenarios remains fairly neglected (only about $11 million spent annually on geoengineering research). Geoengineering approaches like pumping sulfates into the stratosphere could cool the planet as a last resort.
Other global catastrophic risks like nuclear war, pandemics, and bioterrorism could have devastating outcomes. They receive relatively little attention ($30 million annually for nuclear security, a few million for biosecurity) while being fairly tractable through academic research and policy influence.
The causes we hear least about may be precisely where we can make the biggest difference.
