This reminds me of a brilliant sticker by the group Gender Killer I once saw on a lamppost: "Capitalism is Not a Conspiracy of the Few. It Works Because You Work."
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That comes close to being a pretty good encapsulation of Postne's central argument -- though as Angelus mentioned some time ago, Postone can't draw very good politics from his own theory! (And of course, neither can any of his grad students apparently.)
I would add that capitalists themselves can't stop being capitalists (even if as individuals they wanted to) as long as workers continue to be workers.
Carrol