1) Population in China: Until recently, Chinese families did not much alter their fertility depending on life events like deaths of children. However, under government prodding and eventually coercion, fertility drops drastically in China in the 1970s, but, to counteract momentum, the One-Child Policy starts in 1979-80. 2) Population Growth and Economic Development: In Asia, rapid fertility drops have preceded economic booms by ~15 years. In this time, children grow up and become workers. With many workers and fewer children to support, savings and investments rise causing the boom. Non-Asian countries with rapid fertility drops, like Ireland, fit this model. Sub-Saharan Africa, with still high fertility, makes little economic progress.