Source: Author’s calculations based on the 1962 SFCC, the 1968 MESP (Wolff 1980), and the 1983, 1989, 1992, 1995, 1998, 2001, 2004, 2007, 2010, and 2013 SCP.
Direct correspondence to: Edward N. Wolff at ew1@nyu.edu, Department of Economics, New York University, 19 West 4th Street, New York, NY 10012.