平均數是 misleading，US絕大多數人Wealth沒有增長

0.1%的頂尖富人，一年財富增長22%。 如果全社會平均有4.5%的增長，那麽剩餘的99.9%會有多少增長呢?

"Wealth inequality, it turns out, has followed a spectacular U-shape evolution over the past 100 years. From the Great Depression in the 1930s through the late 1970s there was a substantial democratization of wealth. The trend then inverted, with the share of total household wealth owned by the top 0.1 percent increasing to 22 percent in 2012 from 7 percent in the late 1970s. The top 0.1 percent includes 160,000 families with total net assets of more than $20 million in 2012."