This graph is skewed. It doesn't take into account that for 2002 its only 2 years removed from the dot com crash and only 1 year removed from 9/11, when the markets crashed again. In 2012, we've had great markets for a few years. Those with wealth saw the biggest rise as their assets values shot up along with the market.
what man? the graph is to show that the rich get richer and the poor stayed poor.