Comment A, B, P (Score 1) 20
The problem with Karl Marx, as with most economists of any stripe, is they are incredibly short sighted, and cannot see beyond the present generation very easily.
Thus B replaced A (Aristocrats) by revolution and good business sense, just a generation or three before Karl lived. So he expected P would replace B eventually (because that's what progress means). He failed to take into account original sin, thus B & P really aren't that much better than A, the feudal lords they replaced.