This study examines the assertion that the growth of unionism since the 1930s has been associated with an increase in the relative income share of labor. More specifically, its main purpose is to test the hypothesis that there exists a positive correlation between the growth of unionism and changes in the ration of production workers' wages to value added by manufacture.

This study examines the assertion that the growth of unionism since the 1930s has been associated with an increase in the relative income share of labor. More specifically, its main purpose is to test the hypothesis that there exists a positive correlation between the growth of unionism and changes in the ration of production workers' wages to value added by manufacture.