Labour's share of GDP has roughly stayed constant. GDP per capita has increased, both real and nominal.
However, in the late 20th century—after many decades of relative stability—the labor share began to decline in the United States and many other economically advanced nations, and in the early 21st century it fell to unprecedented lows.
PS: In terms of overall GDP a numbers (edit: not real data) 21% vs 17% may seem more or less stable but that’s a 20% drop or roughly all inflation adjusted per capita GDP growth over the last 20 years.
But looking at the graphs, there seems to have indeed been a big drop in the labour share since the dot com boom.
If I remember right, the capital share has been stable. But the share going to real estate has exploded.
And that's likely for the same underlying reasons construction costs have skyrocketed. See https://www.brookings.edu/bpea-articles/deciphering-the-fall... and https://ftalphaville.ft.com/2014/02/03/1759582/piketty-and-t...
Anyway, it’s 1AM so I am a little out of it.
However, the FED induced inflation in assets has made everything out of control.