That's a tempting theory, but the increased ratio of white vs blue collar jobs isn't enough to explain it. See graph on https://www.businessinsider.com/great-ne

That's a tempting theory, but the increased ratio of white vs blue collar jobs isn't enough to explain it. See graph on https://www.businessinsider.com/great-news-weve-become-a-white-collar-nation-2010-1 https://www.businessinsider.com/great-news-weve-become-a-whi...