Have a look over here:

https://www.dol.gov/wb/stats/facts_over_time.htm

The US ratio of female/male employment experienced a strong long-term upward trend during and after WWII (1940s), and the absolute number of women working jobs in the US has climbed steadily right to the present day.

The modern era of wage stagnation relative to productivity started in the 1970s, somewhat before the strongest growth in the female/male employment ratio, and continuing even after that ratio flattened out.

http://www.epi.org/files/2013/ib388-figurea.jpg.538 http://www.epi.org/publication/charting-wage-stagnation/

...a corresponding increase in demand with the supply of workers would have kept incomes moving upward...

Or it could send jobs overseas to poor countries with low wages and little in the way of labor or environmental regulation.