Forbes : After a hiatus that produced the 2012 Forbes 400, the definitive annual chronicle of American wealth, Who Got Rich This Week is officially back. In the interim, we found that the very rich got significantly richer over the past twelve months, by a combined $200 billion to be exact. The total wealth of the 400 richest Americans grew to $1.7 trillion, with the average net worth of a list member rising to $4.25 billion.
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