This article about Karl Marx is, one, in CNN, and two, not bad at all:

Karl Marx was a middle-class philosopher, economist, and journalist (whose main employer was a New York newspaper). He was also flawed in the extreme. He drank excessively, behaved shamefully in his home life, and worked obsessionally, though he produced little that earned him money or recognition during his lifetime. These flaws, however, made him more interesting because, despite being in a state of near constant personal crisis, he was able to accomplish what he set out to do — he changed the world.

All that Karl Marx pointed out, and John Maynard Keynes also made this point in the 1930s, is that recessions or busts in capitalism are caused by overproduction and not real scarcity. Meaning, this is a social crisis and not a natural one. Capital, however, wants us to see it as natural.