Only 4 Americans left on Forbes's billionaire list

Forbes's list shows wealth expanding in emerging markets around the globe, with Russia overtaking Germany as the second- richest country, and 70 percent of newcomers from Russia, India, China and the U.S. In 2006, half of the top 20 billionaires came from the U.S. This year there were only four Americans.

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To quote Bob Dylan "the times, they are a changing"