Chronic Disease Burden and the Interaction of Education, Fertility, and Growth
以美国南部钩虫病的根除为案例，检验生育的数量-质量框架，发现根除后生育率显著下降，且人力资本反应与生育反应的相对规模与长期趋势一致。
This study considers the eradication of hookworm disease from the American South as a test of the quantity-quality (Q-Q) framework of fertility. Eradication was principally a shock to the price of quality because of three factors: hookworm (i) depresses the return to human-capital investment, (ii) had a very low case-fatality rate, and (iii) had negligible prevalence among adults. Consistent with the Q-Q model, we find a significant decline in fertility associated with eradication. Relative sizes of fertility and human-capital responses to hookworm indicate that the Q-Q mechanism is of a similar magnitude to secular co-movements in these same variables.