This is a great post from Carpe Diem showing that it is patently false that the poor get poorer and the rich get richer:
A Treasury Department study of the 1996–2005 period used IRS income tax data to discern considerable mobility: more than 55% of taxpayers moved to a different income quintile. More than half the people in the lowest fifth of earners moved to a higher quintile over this period (29% to the second, 14% to the third, 10% to the fourth, and 5% to the highest).
Moreover, there is a great deal of movement in and out of the top income groups. The Treasury data show that 57% “of households in the top 1% in 2005 were not there nine years earlier.” The rich sometimes get richer, but they get poorer as well. The study also reveals that income mobility has increased, not decreased, during the past twenty years. For example, 47.3% of those in the lowest income quintile in 1987 saw their incomes increase by at least 100% by 1996. That number jumped to 53.5% from 1996 to 2005.
Here is the link: Income movement