The Long-Run Growth of Disability Insurance in the United States

Kevin Milligan, Social Security Programs and Retirement around the World: Historical Trends in Mortality and Health, Employment, and Disability Insurance Participation and Reforms (University of Chicago Press, 2012), chap. 10, https://www.nber.org/books-and-chapters/social-security-programs-and-retirement-around-world-historical-trends-mortality-and-health/long-run-growth-disability-insurance-united-states.