In 2010 the investor Warren Buffett won praise for backing President Obama’s suggestion of a 30 percent minimum income tax for those making over a million dollars a year, a guideline that Obama tried to endear to the American public by attaching Buffett’s name to it. Buffett admitted he paid a rate of only 17.4 percent (about $6 million) on his income of $40 million a year. It took the supply-side economist Arthur Laffer to point out—correctly—that in 2010 Buffett’s net worth had actually risen not by $40 million but by $10 billion, a figure that was 250 times as large as the one Buffett
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