Theory predicts a positive relationship between market concentration and profitability in most scenarios. In empirical work, however, this relation is frequently not found or only a weak connection is observed. We compare the performance of concentration and market share variables, which are...

The thesis contributes to the theoretical discussion of the effects of temporary agency work and picks up three different issues that have not been analyzed yet. It provides three theoretical models 1) to discuss the optimal economic behavior of firms and labor unions when firms threaten to use...