This paper describes the construction of time-consistent national and state-level estimates of union density for the years 1964 through 2000. Two sources of data are combined to produce these estimates, the Current Population Survey (CPS), a monthly survey of U.S. households, and the...

Wages for black and white workers are substantially lower in occupations with a high density of black employees, following standard controls. Such correlations can exist absent discrimination or as a result of discrimination. In wage level equations, the magnitude of the correlation falls...