We exploit tax-induced exogenous variance in the price of union membership to identify the effects of changes in firm 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...

This paper looks at the financial resources of trades unions in the UK, both updating previous work and attempting to understand the management of first and second order collective action problems. First order problems refer to the problems of initiating collective action and second order...