Template-Type: ReDIF-Paper 1.0 Title: Union and Firm Labor Market Power Author-Name: Miren Azkarate-Askasua Author-Email: azkarate-askasua@uni-bonn.de Author-Name: Miguel Zerecero Author-Email: mzerecer@uci.edu Classification-JEL: J2, J42, J51 Keywords: Labor markets, Wage setting, Misallocation, Monopsony, Unions Abstract: Can union and firm market power counteract each other? What are the output and welfare effects of employer and union labor market power? Using data from French manufacturing firms, we leverage mass layoff shocks to competitors to identify a negative effect of employment concentration on wages. In line with the reduced form evidence and the French institutional setting, we develop and estimate a multi-sector bargaining model that incorporates employer market power. We find that in the absence of unions output decreases by 0.48 percent because they partially counteract distortions coming from oligopsony power. Furthermore, eliminating employer and union labor market power increases output by 1.6 percent and the labor share by 21 percentage points. Workers’ geographic mobility is key to realizing the output gains. Note: Length: 92 Creation-Date: 2023-11 Revision-Date: File-URL: https://www.crctr224.de/research/discussion-papers/archive/dp475 File-Format: application/pdf Handle: RePEc:bon:boncrc:CRCTR224_2023_475