I can't speak for other countries because I never looked at the data but in Germany, increasing wealth inequality correlates with decreasing union membership in

I can't speak for other countries because I never looked at the data but in Germany, increasing wealth inequality correlates with decreasing union membership in recent decades while the big and broadly distributed wealth gains of the post-war era correlated with historically high levels of union memberships. Intuitively it would make sense that rising income inequality is the result of too little unionization, not too much or it being irrelevant. Also, there is plenty of actual research that backs this up, i.e.: - https://www.epi.org/publication/unions-help-reduce-disparities-and-strengthen-our-democracy/ https://www.epi.org/publication/unions-help-reduce-dispariti...