US income and disposable income figures for the middle class are among the highest in the world. Only a few wealthy countries like Switzerland and Norway compare. In terms of household disposable income, the US is the highest in the world. The full-time median US job pays about $50,000 now.
The US household disposable income figure is drastically higher than in most of developed Europe. 50% higher than Sweden, the Netherlands or Finland:
https://www.statista.com/statistics/725764/oecd-household-di...
This is has been true for a long time:
https://skift.com/2013/05/15/u-s-has-the-highest-disposable-...
The median household disposable income figure typically places the US in the top few nations:
https://mises.org/wire/when-it-comes-household-income-sweden...
The median household wealth figures are higher in the US than in Germany or Sweden (but lower than France or Britain).
The US also has an extremely progressive income tax setup, with the middle class having among the lowest income tax burden of any developed nation.
At $50,000 in a typical city like Atlanta or Pittsburgh, the typical person will pay 20% in total income taxes. In Texas (no state income tax) you can climb up to around $70,000 and still stay under a 20% rate. In most of the US you can make $200,000 and still be close to a 30% rate. The US middle and middle-upper class is entirely oblivious to how hyper low their taxes are (as a trade-off they are not getting guaranteed universal healthcare either of course, their employer must cover it or they have to).
If the US ever fixed its healthcare disaster and brought costs under proper control (shaving a trillion dollars in annual costs), in financial respects at least it'd be nearly a paradise.