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"Medical research indicates that breastfeeding suppresses post-natal fertility. We model the implications for breastfeeding decisions and test the model's predictions using survey data from India. First, we find that breastfeeding increases with birth order, since mothers near or beyond their desired total fertility are more likely to make use of the contraceptive properties of nursing. Second, given a preference for having sons, mothers with no or few sons want to conceive again and thus limit their breastfeeding. We indeed find that daughters are weaned sooner than sons, and, moreover, for both sons and daughters, having few or no older brothers results in earlier weaning. Third, these gender effects peak as mothers approach their target family size, when their decision about future childbearing (and therefore breastfeeding) is highly marginal and most sensitive to considerations such as ideal sex composition. Because breastfeeding protects against water- and food-borne disease, our model also makes predictions regarding health outcomes. We find that child-mortality patterns mirror those of breastfeeding with respect to gender and its interactions with birth order and ideal family size. Our results suggest that the gender gap in breastfeeding explains 14 percent of excess female child mortality in India, or about 22,000 "missing girls" each year"--National Bureau of Economic Research web site

"Smoke from massive wildfires blanketed Indonesia in late 1997. This paper examines the impact this air pollution (particulate matter) had on fetal, infant, and child mortality. Exploiting the sharp timing and spatial patterns of the pollution and inferring deaths from "missing children" in the 2000 Indonesian Census, I find that the pollution led to 15,600 missing children in Indonesia (1.2% of the affected birth cohorts). Prenatal exposure to pollution largely drives the result. The effect size is much larger in poorer areas, suggesting that differential effects of pollution contribute to the socioeconomic gradient in health"--National Bureau of Economic Research web site

"Longer life expectancy should encourage human capital accumulation, since a longer time horizon increases the value of investments that pay out over time. Previous work has been unable to determine the empirical importance of this life-expectancy effect due to the difficulty of isolating it from other effects of health on education. We examine a sudden drop in maternal mortality risk in Sri Lanka between 1946 and 1953, which creates a sharp increase in life expectancy for school-age girls without contemporaneous effects on health, and which also allows for the use of boys as a control group. Using additional geographic variation, we find that the 70% reduction in maternal mortality risk over the sample period increased female life expectancy at age 15 by 4.1%, female literacy by 2.5%, and female years of education by 4.0%"--National Bureau of Economic Research web site

A popular environmental policy is to pay forest owners for avoiding deforestation on their land. This is an example of "payments for ecosystem services" (PES). This paper shows that liquidity constraints can limit the effectiveness of PES programs. If an individual would have cut down trees to sell them, his opportunity costs are more front-loaded than the stream of PES income. If credit constrained, he might decline the program even if the net present value (NPV) of the PES income exceeds the NPV of his opportunity costs. I present evidence consistent with this prediction using data on forest owners in Uganda.