the chart says everything we've all suspected if not said; 

Since 1979, the top income earners in America have seen their real wages grow at more than double the rate of every other income group.

Given this rapid rise, income inequality in the U.S. exceeds nearly every other rich nation, driven by several complex factors. Among these, tax policy, technological change, and economic downturns have widened this gap. Diminishing bargaining power across workers has also contributed to wage disparities.

This graphic, via Visual Capitalist's Dorothy Neufeld, shows the growth in real wages over time across income groups, based on data from the Economic Policy Institute..........more.......