union density on firm productivity and wages in the population of Norwegian firms over the period 2001 to 2012. Increases in … union density lead to substantial increases in firm productivity and wages having accounted for the potential endogeneity of …

firms productivity levels within the industry. Less pronounced differences in productivity levels make it easier to design … collective wage contracts that are accepted by a wider range of firms within an industry. Higher dispersion in productivity … likely to decrease. We measure correlations between productivity variation and collective bargaining coverage in various …