United States Census Bureau; https://www.nrc.gov/docs/ML1208/ML120810045.pdf.
14
World Bank; http://data.worldbank.org/indicator/SP.POP.65UP.TO.ZS.
15
China’s Demographic Time Bomb // Time, Aug. 31, 2011; http://www.time.com/time/world/article/0,8599,2091308,00.html.
16
Posner, гл. 9.
17
Haber and Gratton // PP. 24–25, 39.
18
E. Arias United States Life Tables // National Vital Statistics Reports 62 (2014): 51.
19
L. E. Jones and M. Tertilt An Economic History of Fertility in the U. S., 1826–1960. NBER Working Paper Series, Working Paper 12796, 2006; http://www.nber.org/papers/w12796.
