The impact of part-time employment on union density

Because part-time employees are less likely to be unionized than full-timers, increases in part-time employment may lower unionization rates. However, the size of the reduction, after controlling for other factors, has not been estimated. My results obtained from a probit analysis indicate that part-time status has a small, but significant, negative effect on the probability that a worker is a union member. Not surprisingly, as the working hours of part-time employees decrease, the negative effect increases. The results of this analysis also show that the negative effect of part-time variables had decreased between 1973 and 1989. I thank Darold T. Barnum of the University of Illinois, Chicago and Richard U. Miller of the University of Wisconsin, Madison for their valuable comments and support.