Chetty, Raj, David Grusky, Maximilian Hell, Nathaniel Hendren, Robert Manduca, and Jimmy Narang. 2017. “The Fading American Dream: Trends in Absolute Income Mobility since 1940,” p. 398. Science 356(6336): 398-406. https://science.sciencemag.org/content/356/6336/398/tab-pdf.