John T. Addison
University of South Carolina – Moore School of Business – Department of Economics; Institute for the Study of Labor (IZA)
Universidade de Coimbra – Faculdade de Economia; Center for European Economic Research (ZEW)
Government of the Federal Republic of Germany – Institute for Employment Research (IAB)
Institute for Employment Research (IAB); Institute for the Study of Labor (IZA)
IZA Discussion Paper No. 7474
This study provides updated evidence on the union contract differential in Germany using establishment-wide wage data and two estimation strategies. It provides pairwise estimates of the union differential based on separate samples of collective bargaining leavers and joiners vis-à-vis the corresponding counterfactual groups. It is reported that average wages increase by 3 to 3.5 percent after entering into a collective agreement and decrease by 3 to 4 percent after abandoning a collective agreement. Excluding establishments that experience mass layoffs little influences these net findings, although such establishments record wage losses – statistically insignificant for joiners but up to 10 percent in the case of leavers, as compared with the counterfactuals. The backdrop to these new indicative estimates, which are properly conditioned on establishment size and industry affiliation, inter al., is one of wage stagnation and continuing union decline.