That's an ever-dwindling section of the population. Middle class and upper middle class is going away, we're very clearly heading towards ultra-polarization.
For some reason I always get pushback for pointing it out, but we are very quickly heading towards a bifurcated world like Elysium, possibly minus the space station, where a tiny ultra-rich class lives in luxury while physically separated and protected from billions who live in squalor. We're producing everything needed to build and enforce that world!