Single parent households make less money.
The decline in marriage rates among poorer men and women robs parents of supplemental income, of work-life balance, and of time to prepare a child for school. Single-parenthood and inter-generational poverty feed each other. The marriage gap and the income gap amplify one another.
Better educated, higher-income men and women tend to marry each other which perpetuates the cycle:
The marriage inequality crisis creates a virtuous cycle at the top and a vicious one at the bottom. It pushes educated and non-educated Americans into entirely different worlds.