But then you have things like "works for a living, but contributes to a 401k". Now they work for a living, and their net wealth grows from other people working

But then you have things like "works for a living, but contributes to a 401k". Now they work for a living, and their net wealth grows from other people working. (I mean, not enough - yet - for them to be able to quit working themselves...) So where are they? They have a foot in both worlds. And there are tens of millions of them. They work, but they're taking what they can from what they earn, and using that to bootstrap them toward the "don't have to work" category, but they aren't there yet. Those people are fundamentally different from "working class", even though they work.