A firm's decision to employ agency workers may be perceived as a replacement of directly employed workers or as way to curb union power, which trade unions would oppose. Alternatively, trade unions may encourage the (temporary) employment of agency workers in a firm, if they manage to bargain...

Using a large employer-employee dataset, we provide new evidence on the relationship between the gender pay gap and industrial relations from within German workplaces. Controlling for unobserved workplace heterogeneity, we find no evidence that introducing or abandoning collective agreements or...