Capítulo 1
The Economics of Poverty: A Revolutionary Perspective
Have you ever wondered why, despite billions in aid and decades of effort, global poverty persists? What if our fundamental assumptions about the poor are wrong? In "Poor Economics," MIT economists Abhijit Banerjee and Esther Duflo challenge conventional wisdom with evidence from 15 years of groundbreaking field research. This isn't just another development economics book-it became an instant classic that revolutionized how we approach poverty, winning Banerjee and Duflo the 2019 Nobel Prize in Economics alongside Michael Kremer. Through vivid stories and rigorous experiments across five continents, they reveal the sophisticated economic lives of those living on less than $1 per day. Their approach rejects grand theories in favor of understanding the specific challenges faced by real people, showing how small changes can create enormous impacts. As Bill Gates noted, "Their work is both revolutionary and accessible... they offer a refreshingly original take on how to fight global poverty."
Capítulo 2
Beyond Hunger: The Complex Reality of Food and Nutrition
For many Westerners, poverty conjures images of starvation-people desperately needing more calories. This association drives massive government food subsidy programs worldwide, from Egypt's $3.8 billion annual expenditure to India's proposed Right to Food Act. The underlying theory suggests a nutrition-based poverty trap: the poor can't afford enough food, making them less productive, keeping them poor.
Yet the evidence tells a more nuanced story. When poor households get additional income, they don't maximize calories. In Maharashtra, a 1% increase in overall expenditure translated to just 0.67% increase in food spending. Even more revealing, when spending on food increases, people buy better-tasting, more expensive calories rather than maximizing nutrition. In a Chinese study, households given staple food subsidies actually consumed less of those items, choosing to eat more shrimp and meat instead.
This doesn't mean nutrition isn't problematic. South Asians are notably small-statured-33% of Indian men and 36% of women were undernourished by BMI standards in 2004-2005. Child malnutrition in India is devastating-half of children under five are stunted, with rates roughly double those in sub-Saharan Africa. This malnutrition has consequences beyond physical stature, affecting cognitive development and adult earning potential.
Why don't the poor invest in better nutrition? One explanation is that the benefits aren't always visible or immediately rewarded. The Indonesian study on iron supplementation found that self-employed workers earned $46 more annually from a $7 investment in iron-fortified fish sauce-but only self-employed workers saw this benefit. Employees paid flat wages had no financial incentive to improve productivity through better nutrition.
The poor also have other priorities beyond food. In Morocco, we met Oucha Mbarbk who, despite claiming he needed more money for food, owned a television, parabolic antenna, DVD player, and cell phone. When questioned about this apparent contradiction, he laughed and said, "Television is more important than food!" His perspective made sense in context-village life can be monotonous with limited entertainment options.
While nutrition-based poverty traps don't appear to affect most adults, nutrition remains critical for those who don't choose what they eat: unborn babies and young children. Small nutritional investments during childhood yield enormous returns later. This suggests governments need to rethink food policy beyond simply supplying more grains, focusing on micronutrients, deworming programs, and fortified foods.
Capítulo 3
The Health Paradox: Cheap Solutions, Expensive Choices
Health represents an area of both great promise and frustration. Many low-cost interventions like vaccines and bed nets could save lives, yet few people utilize these preventive technologies. Of the 9 million children who die before age five annually, most are poor children from South Asia and sub-Saharan Africa, with roughly one-fifth dying from diarrhea. While vaccines are being developed, three "miracle drugs" could already save most of these children: chlorine bleach for water purification, and salt and sugar for oral rehydration solution (ORS).
Yet adoption rates remain low. In Zambia, despite chlorine being widely available and affordable (800 kwachas/$0.18 USD PPP for a family of six), only 10% of families use it. In India, only one-third of children with diarrhea receive ORS. Why are 1.5 million children dying annually from a disease that could be prevented with bleach and treated with boiled water, sugar, and salt?
Despite their reluctance to spend on preventive care, the poor do care deeply about health. When asked whether they experienced a period of feeling "worried, tense, or anxious" in the recent past, about one-fourth of the poor in both rural Udaipur and urban South Africa said yes-much higher than in the United States. The most frequent source of this stress (44% in Udaipur) was their own health or that of close relatives.
The issue isn't how much the poor spend on health, but what they spend it on-typically expensive cures rather than cheap prevention. Many developing countries have triage systems to provide affordable basic care near people's homes, with trained personnel who can treat simple conditions and refer serious cases to higher levels. Yet the poor largely avoid this free public health system, choosing private providers instead.
Government healthcare systems often fail the poor through chronic absenteeism and poor service quality. In Udaipur, researchers found health centers closed 56% of the time during scheduled hours. Even when present, government providers deliver shockingly poor care. Das and Hammer's research revealed what they call the "3-3-3 rule": the median patient interaction lasts three minutes, doctors ask three questions, and prescribe three medicines.
The poor's health decisions are shaped by limited information and difficult learning environments. Without basic scientific knowledge, they develop plausible but incorrect theories (like preferring injections that deliver medicine "directly to the blood"). Learning from experience is nearly impossible with self-limiting illnesses or preventive measures like vaccines where cause-and-effect relationships aren't obvious.
When facing serious health problems they cannot afford to treat, the poor need hope. They focus on minor ailments they can address while avoiding expensive diagnostics for potentially life-threatening conditions. This explains why chest pains become "bhopa diseases" (treated by traditional healers) while fevers receive medical attention.
The immunization puzzle-where 77% start but few complete the series-reflects "time inconsistency," the same psychological barrier behind broken gym resolutions. We value present comfort over future benefits, perpetually postponing small costs. This explains why minor obstacles prevent life-saving behaviors and why small incentives (like 2 pounds of dal) dramatically increased immunization rates sevenfold in Udaipur.
Health policy in poor countries should make preventive care as effortless as possible: free chlorine dispensers by water sources, rewards for immunization, school-based deworming, and public investment in water and sanitation. Though this approach seems paternalistic, those in rich countries already benefit from embedded paternalism that frees mental space for other concerns.
Capítulo 4
Education's Broken Promise: Why Schools Fail the Poor
In Karnataka, India, we met Shantarama, a widow supporting six children after her husband's unexpected death. Contrary to expectations, she kept most of her children in school, with her oldest son studying to become a teacher. Yet two middle children refused to attend despite available schools. This pattern reflects a broader puzzle: despite free, accessible schools and high enrollment rates worldwide, absenteeism ranges from 14-50% in our global surveys.
Education policy debates mirror aid debates, dividing between interventionists (the "supply wallahs") who focus on classroom access, and those favoring market forces. The supply position dominates international policy, exemplified by the Millennium Development Goals targeting universal primary education and gender parity. Governments have responded-95% of Indian children now have schools nearby, and many African countries offer free primary education.
But access doesn't guarantee learning. Teacher absenteeism plagues many countries, with instructors missing one day in five on average. In India, Pratham's nationwide assessment found 35% of children aged 7-14 couldn't read a first-grade paragraph, and 60% couldn't read a second-grade story. Only 30% could do basic division-raising the disturbing question of whether schools might actually be making children unlearn practical math skills they use in daily commerce.
The "demand wallahs" argue that education quality remains poor because parents don't value it enough, seeing insufficient economic returns. Evidence supports this view: during India's Green Revolution, education increased faster in regions where new agricultural technology raised the value of learning. Similarly, when call centers began recruiting in rural northern India, girls' school enrollment increased by 5 percentage points in those villages.
Despite skepticism that top-down education policies waste resources in communities where parents don't value education, evidence suggests otherwise. Indonesia's massive school-building program after the 1973 oil boom proved remarkably successful. Using a formula that prioritized areas with the most unschooled children, the INPRES program significantly increased wages for the generation that benefited from the new schools. Each additional year of primary education raised wages by about 8%-comparable to returns in the United States.
Private schools have gained surprising cross-political support, with even India's Left backing the Right to Education Act that provides vouchers for private education. Low-income parents worldwide increasingly seek affordable private education, with schools charging as little as $1.50 monthly. These modest operations, often run by local educated women seeking income without leaving their villages, typically outperform public schools.
Parents' distorted expectations about education fundamentally shape educational outcomes. In collage exercises in rural India, parents consistently chose images of luxury cars and jewelry to represent what education would bring their children-revealing their view of education primarily as a path to considerable wealth through government or office jobs.
Parents consistently misperceive the returns to education as following an S-shaped curve rather than the linear reality. In Madagascar, parents believe primary education increases earnings by just 6% per year while secondary education yields 12-20% per year. This misconception leads parents to concentrate resources on their most "promising" child rather than investing equally in all children's education-creating an artificial poverty trap.
Education interventions often disappoint because curricula and teaching methods are designed for elite students rather than average children. Michael Kremer's textbook experiment in Kenya showed no improvement in average test scores-only top students benefited because textbooks were in English, a third language for most children. Private schools don't perform better because they focus on preparing top students for gateway exams while neglecting the rest.
The good news is that ensuring every child learns the basics is quite straightforward when that becomes the focus. Several key principles emerge from successful educational interventions: focusing on basic skills with the belief that every child can master them; recognizing that effective remedial teaching requires minimal training; reorganizing classrooms to allow children to learn at their own pace; setting realistic expectations; establishing proximate goals rather than distant ones; and leveraging technology.
Capítulo 5
Family Planning: Beyond Access to Contraception
The chapter opens with the story of Sanjay Gandhi's aggressive population control campaign during India's Emergency period (1975-1977). Despite holding no official position, Gandhi implemented aggressive sterilization quotas that resulted in 8.25 million sterilizations in 1976-1977, often through coercive means including threats, fines, and even police roundups. Though temporarily effective, the program was widely resented and contributed to Indira Gandhi's electoral defeat in 1977.
The authors examine whether lack of access to contraception explains high fertility rates among the poor. While UN reports suggest filling "unmet demand" for modern contraceptives could significantly reduce maternal deaths, evidence suggests access alone isn't the primary issue. Studies from Indonesia, Bangladesh's Matlab program, and Colombia's Profamilia program indicate that simply making contraceptives available has limited impact on overall fertility rates.
While contraceptive access may not significantly reduce overall fertility, it can help teenagers postpone pregnancies, as seen in Colombia where it led to better job outcomes for women. Unfortunately, many countries restrict teenagers' access to family planning services without parental consent, contributing to extremely high teenage pregnancy rates in developing countries, particularly in sub-Saharan Africa and Latin America.
Three different strategies were tested in Kenyan schools with dramatically different results. The ABCD curriculum (Abstain, Be faithful, use a Condom... or you Die) showed no effect on sexual behavior or pregnancy rates. However, simply informing girls that older men have higher HIV infection rates reduced "sugar daddy" relationships by two-thirds and cut pregnancy rates from 5.5% to 3.7%. Providing free school uniforms reduced pregnancy from 14% to 11%.
Fertility decisions involve competing preferences between men and women, with men typically preferring larger families and less contraception than their wives. How contraceptives are provided matters tremendously. In Zambia, women given contraceptive vouchers privately were 23% more likely to use family planning services and had 57% fewer unwanted births than women whose husbands were present when receiving vouchers.
For the poor, children function as comprehensive financial instruments-insurance policies, savings vehicles, and lottery tickets all in one. Pak Sudarno, an Indonesian scrap collector with nine children, explained that having many children ensured at least some would succeed and care for him in old age. Unlike the wealthy who have access to Social Security, retirement funds, and insurance, most of the world's poor rely on children for old-age security.
When fertility decreases, financial savings typically increase. After China introduced family planning in 1972 and the one-child policy in 1978, households with their first child born after 1972 averaged one less child and had savings rates approximately 10 percentage points higher than earlier cohorts.
Capítulo 6
Risk Management: The Poor as Reluctant Hedge Fund Managers
Risk dominates the lives of the poor, who often run small businesses, farms, or work as casual laborers with no employment guarantees. A single misfortune can devastate their precarious existence, as illustrated by Ibu Tina's story. Once a successful garment business owner with her husband, a series of disasters-a bad check, police corruption, and a failed business venture-left her impoverished and living with her mother, caring for four children including a traumatized daughter.
The poor are like hedge-fund managers but with complete liability for losses and no safety net. About 50% of urban poor run non-agricultural businesses, while 25-98% of rural poor operate farms, mostly on non-irrigated land vulnerable to weather fluctuations. Even casual laborers face extreme uncertainty, often working far fewer days than those with stable employment-in Gujarat, India, the bottom third of casual workers averaged only 137 workdays annually.
When faced with economic hardship, the poor's natural impulse to work more can be self-defeating. In isolated villages, when everyone seeks more work during droughts or price spikes, they compete against each other, driving wages down further.
Instead, the poor diversify like sophisticated hedge-fund managers, but with activities rather than financial instruments. In West Bengal villages, even farming families spend only 40% of their time farming, with the median family having three working members engaged in seven different occupations. This diversification provides crucial risk protection when one income source fails.
Village networks provide crucial but imperfect informal insurance. Christopher Udry's Nigerian study found the average family was involved in lending relationships with 2.5 other families, with flexible repayment terms adjusted to both parties' circumstances. When borrowers suffered shocks, they repaid less; when lenders faced hardship, borrowers repaid more than owed.
Despite these impressive solidarity mechanisms, research across countries from Cote d'Ivoire to Thailand shows informal insurance remains incomplete. Health shocks are particularly poorly insured through informal networks. In Indonesia, household consumption drops 20% when a member falls severely ill, and Philippine villages show notably weak solidarity for non-fatal severe illnesses compared to crop failures or job losses.
Despite the promise of insurance for the poor, implementation faces significant challenges. When SKS Microfinance introduced their "Swayam Shakti" health insurance program, clients actively resisted mandatory enrollment-some prepaid loans early to exploit loopholes, while others simply left for competing lenders.
The poor understand insurance concepts reasonably well-they correctly answered test questions about hypothetical policies 75% of the time. The real barriers include trust issues (sign-ups increased when familiar organizations were involved), frustration with catastrophic-only coverage that excludes common problems, and the cognitive challenge of paying now for benefits in an unpleasant future they'd rather not contemplate.
Capítulo 7
The Microfinance Revolution: Promise and Limitations
The challenge of lending to the poor begins with a paradox: interest rates for the poor are staggeringly high. In Chennai, fruit sellers pay 4.69% interest per day on working capital loans-a rate that compounds to millions in just a year. These exorbitant rates inspired microfinance pioneers like Padmaja Reddy and Muhammad Yunus, who believed that offering more reasonable rates could transform lives.
Most poor households don't access formal credit. In rural Udaipur, only 6.4% of loans come from formal sources, with most borrowing from relatives (23%), moneylenders (18%), or shopkeepers (37%). Interest rates from informal sources average 3.84% monthly (57% annually) for the extremely poor, with rates decreasing slightly as wealth increases.
The high interest rates charged to the poor stem from several factors. Borrowers become bound to lenders they already know because switching is costly and raises suspicion. Banks cannot effectively compete with local moneylenders because bank officers rotate frequently, lack community knowledge, and cannot use the enforcement tactics of informal lenders.
Microcredit has grown from modest beginnings with BRAC and Grameen Bank in Bangladesh to reach 150-200 million borrowers globally. It balances profit and social missions, exemplified by Muhammad Yunus's Nobel Peace Prize and Compartamos's controversial but successful IPO raising $467 million despite 100%+ interest rates. MFIs reinvented moneylending for social purposes by using group liability-borrowers guarantee each other's loans and meet weekly, creating mutual accountability.
Despite enthusiastic claims that microcredit can transform lives and help achieve development goals, rigorous evidence has been scarce. When Spandana, one of India's most profitable MFIs, agreed to a randomized evaluation in Hyderabad, the results were modest but positive. After 15-18 months, people in neighborhoods with microcredit access were more likely to start businesses (though only increasing from 5% to 7%) and purchase durable goods.
Microcredit's modest impact stems partly from the fact that many poor people aren't willing or able to start businesses. More puzzling is that even with multiple MFIs offering affordable credit in Hyderabad slums, only about one-fourth of families borrowed from them, while over half continued using moneylenders at much higher rates. This likely relates to microcredit's rigid structure-the very features that enable its low-cost lending model.
The microcredit model's necessary focus on repayment discipline makes it poorly suited for financing entrepreneurs seeking to grow beyond micro-enterprises. When India expanded its "priority sector" lending requirements to include somewhat larger firms, these newly eligible businesses invested productively-a 10% increase in loans generated 9% profit after repayment, demonstrating significant untapped potential.
Capítulo 8
Saving Brick by Brick: The Psychology of Poverty
Throughout developing countries, unfinished houses dot the landscape-homes with walls but no roof, missing windows, or protruding beams. These incomplete structures represent how the poor save, building incrementally as cash becomes available. While seemingly inefficient compared to accumulating money in a bank before construction, this brick-by-brick approach reflects limited savings options.
Despite having limited access to credit and insurance, the poor have compelling reasons to save-to buffer against bad harvests or illness, or to start businesses. The Victorian view that poor people are inherently shortsighted and impatient persists in various forms today, but research shows the poor are actually financially sophisticated. In our eighteen-country dataset, formal savings accounts are rare (median 7-8% ownership), yet the poor save through ingenious alternatives: savings clubs, self-help groups, rotating savings and credit associations (ROSCAs), deposit collectors, moneylenders, and "money guards."
Understanding how people think about the future explains apparent contradictions in saving behavior. In Kenya, farmers rarely use fertilizer despite 70% returns on investment. When offered free fertilizer and seeing impressive results, most farmers initially planned to use it again, but the majority didn't follow through. The problem wasn't lack of knowledge but inability to hold onto money between harvest and planting. Farmers like Michael and Anna Modimba explained that saving at home is nearly impossible because "there is always something that comes up" requiring money.
Human psychology creates internal barriers to saving. Our brains process present and future differently, creating "time inconsistency" where we spend today while planning to save tomorrow. Many poor people demonstrate remarkable self-awareness about these tendencies, identifying specific "temptation goods" they wish to reduce.
Self-control challenges affect everyone but hit the poor harder for two reasons. First, the rich can easily satisfy their "temptation needs" while still saving, whereas poor people's major goals (like refrigerators or better schooling) remain distant while temptation goods are immediately accessible. Second, the poor must actively decide to save repeatedly without the automatic deductions available to salaried workers, exhausting their "self-control muscle" while already under stress.
Hope and future opportunity dramatically affect saving behavior. Poor people who see pathways to realize their aspirations will reduce "frivolous" consumption to invest in that future, while those feeling hopeless make decisions reflecting their desperation. An experiment with fruit vendors in India and the Philippines demonstrated this asymmetry. When researchers paid off vendors' debts, 40% remained debt-free for ten weeks. However, almost all eventually returned to debt after experiencing a shock, and once indebted, couldn't escape on their own.
Capítulo 9
The Reluctant Entrepreneur: Why the Poor Need Jobs
A businessman returning to India in the 1970s received an entrepreneurial lesson from his uncle, who showed him four women sitting outside the Bombay Stock Exchange. These women collected wet sand from the beach before dawn, spread it on streets, let passing cars dry it with their heat, then collected and sold the dry sand in small packets for dish scrubbing. This ingenuity-creating something from nothing with extremely limited resources-exemplifies the entrepreneurial spirit among the poor that has inspired the microfinance and social business movements.
Despite their resourcefulness, two troubling realities emerge about poor entrepreneurs: their businesses remain extremely small and typically generate very little income. Most have no paid employees and minimal assets-often just tables, scales or pushcarts. In Hyderabad, only 20% have dedicated business spaces. Unlike exceptional success stories, most businesses never grow substantially. In Mexico, only 41% of businesses operated by the extremely poor survived three years, and employee growth was minimal. These microenterprises also struggle financially-the median business in Hyderabad generated about $115 USD PPP monthly profit, barely enough to pay one person $2 per day.
For most poor entrepreneurs, growing a business is simply too difficult. Consider someone like Xu Aihua who needs $10,000 to buy a machine when starting with just $100. Even with an impressive 25% profit margin and full reinvestment, it would take 21 years to save enough-or 40 years if they needed half their profits to live on. This stark reality kills motivation. Why invest emotionally and financially in a business that will never meaningfully change your life?
The businesses of the poor often represent necessity rather than opportunity. Consider Pak Awan and his wife in Indonesia-they opened a small shop only because he couldn't find construction work and she was rejected from factory jobs. Despite being eligible for expansion loans, they were reluctant entrepreneurs who dreamed their children would secure government jobs. Their shop was simply a way to generate income when conventional employment wasn't available.
When we ask poor people about their ambitions for their children, the overwhelming response isn't entrepreneurship but government employment. In Udaipur, 75% of parents want their sons in government positions, with similar preferences for daughters. The poor crave stability-the defining characteristic that separates the middle class from the poor across our eighteen-country dataset. Stable employment transforms lives, as we witnessed in an Udaipur village near a zinc factory where generational prosperity emerged from secure industrial jobs.
Capítulo 10
From Evidence to Action: Five Key Lessons
Economists have little predictive power about which countries will grow and which will stagnate. Supposed basket cases like Bangladesh become miracles while model nations like Cote d'Ivoire collapse. Though we can't predict growth, it seems reasonable that growth is more likely to take hold where people are educated, well-fed, healthy, and confident enough to invest in their children's futures.
First, the poor often lack critical information and believe falsehoods about immunization benefits, education value, fertilizer usage, HIV transmission, and politicians' actions. This leads to harmful decisions, like unprotected sex with older men or improper fertilizer use. Effective information campaigns must provide new knowledge in attractive, simple formats from credible sources.
Second, the poor bear responsibility for too many aspects of their lives. Unlike the wealthy, they must purify their own water, ensure proper nutrition, and create their own savings systems-all while managing demanding work lives in competitive or precarious employment. Making the "right" choices easier through defaults and nudges can significantly improve outcomes-fortified salt, accessible savings accounts, and conveniently placed chlorine can all make good decisions simpler.
Third, markets often fail the poor or charge them unfavorable prices. The poor receive negative interest on savings while paying exorbitant loan rates because handling small amounts incurs fixed costs. Some markets, like health insurance, haven't developed because available options don't match what the poor need. While innovations like microcredit and electronic money transfers help, governments sometimes need to step in by subsidizing services or providing them directly.
Fourth, poor countries aren't doomed to failure because of poverty or history. Many program failures stem from avoidable design flaws and the "three Is": ignorance, ideology, and inertia. Governance can improve without changing entire social structures-by ensuring inclusive village meetings, monitoring government workers, holding politicians accountable, and clearly communicating service expectations to users.
Finally, expectations often become self-fulfilling prophecies. Children abandon education when teachers signal they aren't smart enough; fruit sellers don't repay debts believing they'll quickly fall back into debt; nurses skip work when nobody expects attendance; politicians don't perform when constituents expect nothing. Yet expectations can change: villages seeing female leaders lose prejudice against women in politics; teachers told simply to ensure children can read accomplish this in summer camps. Success feeds on itself as improvements affect beliefs and behavior, creating virtuous cycles that can start with simple interventions like cash transfers.
