This paper offers a critical evaluation of the notion of collective voice, advanced by Freeman and Medoff (1984) in their pioneering contribution What Do Unions Do? It takes note of theoretical and empirical work supportive of/consistent with the collective voice/institutional response model,...

This paper provides estimates of the union wage gap in Portugal, a nation until recently lacking independent data on union density at firm level. Having estimated nonlinear and linear estimates of the effect of union density on the wage gap, the next stage of the analysis seeks to account for...