Not seeing how it's relevant. The trend is that income of people who make "a lot of money" (defined as the top 1% in this case) has grown much faster than people who don't (defined as the bottom 20% here). It doesn't matter that people move between the groups. ETA: OK I suppose is relevant in one sense.. in that the headline of this thread is can be considered misleading. But that's more of a quibble to me. It would be nice if Sowell had cited his source instead of just a vague 'recent IRS data'. He looked at the 1% and saw that half of them were not there 10 years later. For the top 0.01% 3/4s of them were not there five years later.. but what if you expand it the other way? Say, look at the top 2% or 5%? I'd bet the 'churn' rate goes down a lot.