We determine workforce composition and wages in firms in the presence of productivity spill-overs between co-workers. In equilibrium, workers' wages depend on the production structure of firms, own group size, and aggregate workforce composition in the firm. We estimate the wage effects of...

We analyze the effects of increased immigration of foreign workers on the unionisation rates of native workers in Austrian firms over the period 2002–2012. Our results suggest that lower union density of natives' in firms with more foreign workers is driven not by natives leaving unions, but...