This dissertation comprises three essays on the subject labor market transitions. The first essay presents an empirical analysis of the self-employment behavior of men and women in the United States for the years 1970 to 1990 using data from the Panel Study of Income Dynamics. Using hazard modeling techniques, I determine that age and veteran status are the most important covariates for predicting self-employment quit rates for men, while yearly income is the most significant factor for women. The second essay presents a theoretical model of the behavior of an entrepreneur who is considering establishing a start-up business based on a new idea. A simple model illustrates the effects of differential taxation on income from self-employment an...