Dinlersoz, EminGreenwood, Jeremy2023-05-232023-05-232013-06-062012-05-14https://repository.upenn.edu/handle/20.500.14332/44332Union membership displayed a n-shaped pattern over the 20th century, while the distribution of income sketched a u. A model of unions is developed to analyze these phenomena. There is a distribution of firms in the economy. Firms hire capital, plus skilled and unskilled labor. Unionization is a costly process. A union decides how many firms to organize and its members wage rate. Simulation of the developed model establishes that skilled-biased technological change, which affects the productivity of skilled labor relative to unskilled labor, can potentially explain the above facts. Statistical analysis suggests that skill-biased technological change is an important factor in de-unionization.Computers; Distribution of Income; Flexible Manufacturing; Mass Production; Nu- merically Controlled Machines; Panel-Data Regression Analysis; Relative Price of New Equipment; Skill-Biased Technological Change; Simulation Analysis; Union Coverage; Union Membership; De-unionization; Unions; Income; WagesDemography, Population, and EcologySocial and Behavioral SciencesSociologyWorking Paper