Congressional Budget office: Recent Trends in the Variability of Individual Earnings and Household Income, June 2008: “This Congressional Budget Office (CBO) paper, prepared at the request of Senator Charles E. Schumer and Senator Jim Webb, uses administrative and survey data to examine year-to-year changes in individual earnings and household income since 1984. It also examines variability in earnings and income by factors such as age, sex, and education.”