“…The extent to which collective bargaining does indeed reduce wage inequality depends on a series of factors related to the three bargaining systems discussed in the previous section. First of all, enterprises covered by collective agreements tend to have a more compressed wage distribution than enterprises not covered, reducing within-firm inequality (Kohn and Lembcke, 2007;Moore et al, 2019;Vaughan-Whitehead and Vazquez-Alvarez, 2018). Also, bargaining coverage is negatively correlated with wage inequality within a national labour market; the extent of this, however, also depends on trade union bargaining power and the type of bargaining system (with less clear evidence on the issue of centralisation) (Bosch, 2015;Bryson, 2014;Hayter, 2015;Visser and Checchi, 2011;Wallerstein, 1990Wallerstein, , 1999.…”