Further, "while average pre-tax income for the bottom 50% has stagnated at around $16,000 since 1980, the top 1% has experienced 300% growth in their incomes to approximately $1,340,000 in 2014. This has increased the average earnings differential between the top 1% and the bottom 50% from 27 times in 1980 to 81 times today."
https://www.businessinsider.com/income-inequality-us-economy...
The Financial Times recently published this, which may also be of interest: https://ftalphaville.ft.com/2018/01/04/2197227/eight-charts-...