--the idea being that America's in the toilet because the evil 1% are exploiting the masses in chains blah blah. There are two things that the chart is concealing in order to push this deceit.
One is that "wages and salaries" have in fact soared (contrary to the impression the chart reeks of), but total incomes form all sources have even soared more:
Back in the 1950's wages were two-thirds of people's incomes and now they're only half. No way around it we're better off now than we were in the '50's and that means the rich, poor, and the exalted middle class.
The other thing the chart conceals is soaring American productivity --which the loopy left says is bad but in fact a very good thing. The Gundlach chart shows we now need only 42¢ in wages'n'salaries for the same dollar of GDP that had been costing 52¢ back in 1970. Contrary to what the bonkers left says, costing less and getting more done is a good thing.