the thing that doesn't compute for me is that the definition of upper middle class here is 5-15x the federal poverty line, ok, but in 1970 the federal poverty line was like ~$3k (and ~$22k today) 10x in 1970 (~33k/year) in nyc you could buy a 2,000 sqft apt for like 2.75x your salary [1] today, that same apartment is like >10x - so while perhaps more people are earning "upper middle class" incomes, what that gets you has declined significantly.

[1]https://www.elikarealestate.com/blog/tracing-buying-real-est...