Either Williams or Sowell posited this long ago.
If minorities and women get paid significantly less for the same quality of work,
where are the companies composed solely of black women employees whipping their competitors because of the huge salary advantage?
When women went into the workforce, it created a shift in the supply of available labor, that put downward pressure in wages, one of the results being is that it became harder to support a family on just one wage, it started to take two wages, where before one would have sufficed.