The richest people in America

Published On: Sep 22 2012 07:00:34 PM PDT   Updated On: Sep 29 2014 06:09:18 AM PDT

Buoyed by the stock market, the average net worth of the richest people in America has hit a record $5.7 billion.

David Koch
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Jamie McCarthy/Getty Images

4. David Koch (tie), along with brother Charles, David is co-owner and executive vice president of Koch Industries. Net worth: $42 billion.

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