Famous billionaires like Larry Ellison and Mark Zuckerberg have the theoretical ability to buy every single house in entire cities like Oakland and Berkeley, but no single billionaire could afford to buy every home in San Francisco. If the Walton family of Wal-Mart fortunes and Bill Gates combined their wealth, however, they could theoretically afford all of San Francisco's homes. The 30 billionaires included in the research could together afford to own 6% of total home equity in the U.S. [Redfin]
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