Salon reports on an economist's analysis of the wealth of the Walton family. It puts it terms you can understand. "Insane wealth," is how Salon put it.
In short, six Waltons, with almost $70 billion in assets according to a 2007 Forbes analysis, have assets equal to ALL the assets of the bottom 30 percent of the U.S. population, or about 100 million people.
Keep shopping Walmart and maybe the big six can do even better.