Using data from the Trucking Industry Program Survey of Drivers, the article examines hours of sleep and fatigue among truck drivers. The analysis finds that hours of sleep are inversely related to work time. Using a logit model of falling asleep at the wheel, the authors find hours of sleep,...

This study investigates the market concentration/racial earnings discrimination relationship in two periods: 1984-90 and 1991-96. In each period, the racial wage gap and the residual wage gap are compared for union and nonunion workers in monopolistic and competitive industries. The authors find...