Why is income inequality increasing? How can it be stopped?

"Contrary to popular myth, economic mobility in the land of opportunity is not high, and it’s going down." Written by someone in the top 10%!

https://www.theatlantic.com/magazine/archive/2018/06/the-birth-of-a-new-american-aristocracy/559130/

"Income disparities have become so pronounced that America’s top 10 percent now average more than nine times as much income as the bottom 90 percent. Americans in the top 1 percent tower stunningly higher. They average over 40 times more income than the bottom 90 percent. But that gap pales in comparison to the divide between the nation’s top 0.1 percent and everyone else. Americans at this lofty level are taking in over 198 times the income of the bottom 90 percent."

https://inequality.org/facts/income-inequality/

"This trend, which has picked up post Great Recession, is a reversal of what was seen during and after the Great Depression, where the gap between rich and poor narrowed."

https://www.cnbc.com/2018/07/19/income-inequality-continues-to-grow-in-the-united-states.html

"Income inequality is greater in the United States than in any other democracy in the developed world."

https://www.newyorker.com/magazine/2015/03/16/richer-and-poorer

What can be done to reverse the rise in inequality?
According to Bill Gates:
http://fortune.com/2014/10/15/bill-gates-income-inequality/

Several other suggestions:
https://money.usnews.com/investing/articles/2017-02-14/how-to-solve-income-inequality

Bring your solutions - the country and the word need them!