Part of the reason that middle class wages haven't kept up with worker productivity, is the decline of the union movement in the US.
According to the Deprtment of Labor, 11.8 percent of americans are in unions. Public-sector workers had a union membership rate (37.0 percent) more than five times higher than that of private-sector workers which is 6.9 percent.
Corporations are scared of unions and hire legal teams that charge out at hundreds of dollars per hour to stop a union from organizing.
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