This analysis uses several identification strategies and data sources to control for individual ability and determine the causal effect of marital status and computer usage on wages. Although data from the CPS, NLSY and a data set of identical twins show that there are large cross-sectional...

We examine white and black male nonagricultural self-employment from 1910 to 1997. Self-employment rates fell through 1970 and then rose. White male trends were due to declining rates within industries, ending in 1970, counterbalanced by a continuing shift toward high self-employment industries....

We show that self-employment rates differ substantially across 60 ethnic and racial groups in the United States. These differences exist within broad combinations of groups such as Asians and Hispanics, and are almost as great after regression controls, including age, education, immigrant...