Everybody knows the rich are getting richer, but why they're getting richer remains something of a mystery. Is the system biased?
The shift of income to the top has occurred in the most prosperous English-speaking nations, such as Australia, Britain, and Canada. But it has been most pronounced in the United States.
Thirty years ago, the richest 1 percent of Americans got 9 percent of total national income. By 2007, they had 23 percent. Last year, new census data show, the rich-poor income gap was the widest on record.