A commenter left a link to Michael O. Church’s blog post about classes. It’s worth looking at, although I don’t agree with it 100%.
Church’s depiction of the bottom classes correspond perfectly to Paul Fussell’s bottom classes. There’s an underclass which combines two Fussell classes, the destitute and the bottom-out-of-sight. And then Fussell’s low prole, mid prole, and high prole classes correspond perfectly to Church’s L4, L3 and L2 classes.
I also agree that there is more subtlety to the higher level classes, perhaps, than just distinguishing between middle class and upper middle class, although Church doesn’t make that distinction between those specific two classes strongly enough. But Fussell didn’t really capture the importance to the higher classes of seeking self-actualization through their jobs, and his Class X seems to have become part of the SWPL class, that is if SWPL is an independent class separate from the upper middle class.
Church’s “E2” class corresponds to what Paul Fussell and I call the top out-of-sight class.
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Also, you may want to reread my other blog posts about the top out-of-sight class.