Sleep my little baby-oh Sleep until you waken When you wake you'll see the world If I'm not mistaken. . . Kiss a lover Dance a measure, Find your name And buried treasure. . . Face your life Its pain, Its pleasure, Leave no path untaken.
As far as Marx's analysis of capitalism, there's a lot of very useful ideas in it, but he's developing an abstract model of 19th century capitalism. It's abstract and it's changed.