The famous income series from Piketty and Saez is the basis for most of these arguments.
These are the figures that Auten and Splinter think are overstated.
But their critique applies solely to rich people.
Workers in say the bottom 90 percent never got much income from capital gains and therefore weren’t plausibly affected by the Reagan-era tax changes.
If we look solely at this share of the population here’s what it looks like:¹
Since 1973 the income share of the bottom 90 percent has declined from 47 percent to 32 percent.
Obviously this means that the income share of the top 10 percent has increased from 53 percent to 68 percent.
This is pretty consistent with an even bigger increase for the top 1 percent.