in America, you have a smaller chance of swapping your lower income bracket for a higher one than in almost any other developed economy – even Britain on some measures. To invert the classic Horatio Alger stories, in today’s America if you are born in rags, you are likelier to stay in rags than in almost any corner of old Europe.

Lots of journalistic fluff in this article but thats it in a nutshell...

This problem matters.