6 ideas
When very poor households get more money, food spending rises only modestly, and most of the increase goes to tastier, more expensive calories such as sugar, meat, or better grain rather than more calories. People also spend on festivals, weddings, and television. The authors argue that choices which look irrational make sense because boredom and social obligation are real costs, and because more calories may not raise earnings much.
A poverty trap exists only when income or assets today feed into tomorrow's through an S-shaped curve. Below a threshold, people slide toward poverty, and above it they climb out. Whether a one-time push helps permanently depends on whether that threshold exists for a specific mechanism, such as nutrition, health, or schooling. The authors say this must be tested case by case, not assumed or denied wholesale.
Demand for preventive health goods such as bednets, deworming pills, and chlorine collapses when a tiny price replaces a zero price. Charging for them does not screen for the people who will use them. Because prevention's benefits are delayed and invisible, free distribution, or even small incentives like lentils for immunization, raises use far more than cost recovery does.
Rich people get good choices made for them by default: chlorinated water, automatic vaccinations, mandatory pensions. The poor must actively decide every one of these things themselves. The same procrastination and present bias that everyone has therefore does far more damage to the poor. Policy should build defaults and nudges that take away these daily acts of willpower.
The poor save at very high implicit costs through savings groups, livestock, and deposit collectors who charge fees. This shows real demand for commitment and security. Saving is still hard because temptation, claims from relatives, and the slow pace of accumulation erode resolve. Commitment devices and safe, simple accounts can therefore raise savings significantly.
Randomized evaluations of microfinance found that access to credit raised business investment and durable purchases. It did not significantly raise average consumption, women's empowerment, or health and education outcomes. Most poor entrepreneurs run tiny, low-profit businesses out of necessity rather than as a vocation, so credit alone rarely turns them into growth enterprises.