Interesting study from the US Treasury (2007):

Income Mobility in the U.S. from 1996 to 2005

Some excerpts:

• There is considerable income mobility of individuals in the U.S. economy over the 1996 through 2005 period. More than half of taxpayers (56 percent by one measure and 55 percent by another measure) moved to a different income quintile between 1996 and 2005. About half (58 percent by one measure and 45 percent by another measure) of those in the bottom income quintile in 1996 moved to a higher income group by 2005.

• Median incomes of taxpayers in the sample increased by 24 percent after adjusting for inflation. The real incomes of two-thirds of all taxpayers increased over this period. Further, the median incomes of those initially in the lowest income groups increased more in percentage terms than the median incomes of those in the higher income groups. The median inflation-adjusted incomes of the taxpayers who were in the very highest income groups in 1996 declined by 2005.

• The composition of the very top income groups changes dramatically over time. Less than half (40 percent or 43 percent depending on the measure) of those in the top 1 percent in 1996 were still in the top 1 percent in 2005. Only about 25 percent of the individuals in the top 1/100th percent in 1996 remained in the top 1/100th percent in

• The degree of relative income mobility among income groups over the 1996 to 2005 period is very similar to that over the prior decade (1987 to 1996). To the extent that increasing income inequality widened income gaps, this was offset by increased absolute income mobility so that relative income mobility has neither increased nor decreased over the past 20 years [emphasis added]


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