Middle class end, affluent begins around $10 million
Any major shift in the financial status of the rich could have big implications. A drop in their income and wealth would complicate life for elite universities, museums and other institutions that received lavish donations in recent decades. Governments -- federal and state -- could struggle, too, because they rely heavily on the taxes paid by the affluent.
Perhaps the broadest question is what a hit to the wealthy would mean for the middle class and the poor. The best-known data on the rich comes from an analysis of Internal Revenue Service returns by Thomas Piketty and Emmanuel Saez, two economists. Their work shows that in the late 1970s, the cutoff to qualify for the highest-earning one ten-thousandth of households was roughly $2 million, in inflation-adjusted, pretax terms. By 2007, it had jumped to $11.5 million.
The gains for the merely affluent were also big, if not quite huge. The cutoff to be in the top 1 percent doubled since the late 1970s, to roughly $400,000.