There’s a passage from Barbara Ehrenreich that I used to find very powerful.

The original radical . . . vision was of a society without hierarchies of any kind. This of course means equality among the races and the genders, but class is different: There can be no such thing as “equality among the classes.” The abolition of hierarchy demands not only racial and gender equality, but the abolition of class.

Many still find this formulation appealing, judging by the frequency with which I see similar sentiments expressed by my peers. And I still find it beguiling as well. But over the years I’ve come to see that it’s fundamentally wrong, and encourages a very misleading way of thinking about how class works.