Not the topic of your article. But I didn't want to forget to forward this link:

Wealth inequality grows

In the November edition of Scientific American was an article titled "Is Inequality Inevitable?". The author, Bruce Boghosian, is a math professor at Tufts Univerisity and he makes a good case for how wealth trickles up to the top pretty much automatically.

http://www.openbookproject.net/py4fun/wealth/wealth.html