From
Alternet:
As mentioned before, just look at the first full year of the crisis when workers lost an average of 25 percent off their 401k. During the same time period, the wealth of the 400 richest Americans increased by $30 billion, bringing their total combined wealth to $1.57 trillion, which is more than the combined net worth of 50% of the US population. Just to make this point clear, 400 people have more wealth than 155 million people combined.