The rich keep getting richer, in the United States and especially in the world's emerging markets.

Public and private investments controlled by the richest families are expected to more than double in value to $202 trillion by 2020, from $92 trillion this year, according to survey of millionaires in 25 countries by Deloitte LLP.

Image: A man counts money at his photograph stand at the Times Square in New York October 14, 2010.

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