Abstract
This thesis has revisited the role of union membership, collective agreements and establishment union density for wage levels and dispersion in the period 2004-2011. To investigate the wage effect from these three covariates, two different approaches are presented in this thesis. Pooled OLS and FE estimates are reported to investigate the wage effects on the mean, and unconditional quantile regression to investigate the distributional effects of these covariates. A decomposition of the union non-union wage gap is reported to identify what factors that can/cannot explain this wage gap.