Income Mobility

When people gripe about “the 1%,” do they even know who that is? Income mobility is far more important than income distribution.

Some 94 percent of Americans who reach “top 1 percent” income status will enjoy it for only a single year. Approximately 99 percent will lose their “top 1 percent” status within a decade.
Now consider the top 400 U.S. income-earners—a far more exclusive club than the top 1 percent. Between 1992 and 2013, 72 percent of the top 400 retained that title for no more than a year. Over 97 percent retained it for no more than a decade. advisory board member Mark Perry put it well in his recent blog post on this subject:
Whenever we hear commentary about the top or bottom income quintiles, or the top or bottom X% of Americans by income (or the Top 400 taxpayers), a common assumption is that those are static, closed, private clubs with very little dynamic turnover … But economic reality is very different—people move up and down the income quintiles and percentile groups throughout their careers and lives.