As I said in that thread, this is another statistic that had a rapid and precipitous change starting in the early 1970s. I've stated this elsewhere, but it's like something(s) happened the late 60s/early 70s that totally transformed our world and I have no clue what they were nor can I find anyone who has written about it.
Wealth inequality [1], Real Wage stagnation [2], Obesity Rates [3], Divorce Rates [4]
[1] http://inequality.stanford.edu/sites/default/files/Pathways-...
[2] http://www.epi.org/publication/charting-wage-stagnation/
[3] http://az616578.vo.msecnd.net/files/2015/11/20/6358359882436...