We investigate how exposure to the One-Child Policy (OCP) during early adulthood affects marriage and fertility in China. Exploring fertility penalties across provinces over time and the different implementations by ethnicity, we show that the OCP significantly increases the unmarried rate among the Han ethnicity but not among the minorities. The OCP increases Han-minority marriages in regions where Han-minority couples are allowed an additional child, but the impact is smaller in other regions. Finally, the deadweight loss caused by lower fertility accounts for 10% of annual household incomes, and policy-induced fewer marriages contribute to 30% of the fertility decline.

This paper investigates the long-term impacts of China’s nationwide public health campaigns targeting malaria, measles, and meningitis between the 1960s and 1980s. Exploiting regional variation in precampaign disease prevalence across birth cohorts, we show that these interventions generated sizable improvements in education, cognition, health, and income. As an illustrative case, individuals from high-malaria regions who were fully exposed to the eradication campaign attained about 0.5 additional years of schooling and earned over 10% higher income in adulthood, with cognitive and schooling gains explaining a substantial share of the income effects. Extending the same approach to measles and meningitis vaccination campaigns reveals comparably large benefits, with internal rates of return ranging from 21% to 34%. Together, these findings highlight the lasting socioeconomic returns to early-life health interventions and underscore the role of public health as a foundation for human capital accumulation and long-run economic growth.