A report written in 1999 by two researcher at the Heritage Foundation.They point out some issues to be aware of when looking at income statistics from the Census (and why I have been using data from the Congressional Budget Office which address some of their concerns).
However, their critique focuses on the difference between the bottom 20% and the top 20%. The large amount of income concentrated in the top 5% is not part of their discussion nor is there any mention of the fact that the share of income going to each quintile has changed, regardless of how you measure it.
