Although a definitive answer is impossible, estimates of the extent of income mobility from fathers to sons provide a rough forecast.

In 1978, he introduced a measure based on income Gini coefficients to estimate income mobility.

But claims of greater income mobility have been criticized by both conservative and liberal economists.

You know, we are about income mobility and that's what we should be focussed on to take care of the income disparity in this country.

Also, a closer look at income mobility, full results of The New York Times poll, and a forum for reader responses.

"This isn't your classic income mobility," said Kevin Murphy, a labor economist at the University of Chicago.

Despite the goal of vast accumulation of wealth, income mobility among the Ferengi seems to be quite high.

First, consider what we know from previous studies of trends in intergenerational income mobility.

They actually underestimate income mobility by excluding the most mobile population from their studies: those under age 25.

The paper argues, however, that money is not the only or even the most important factor influencing intergenerational income mobility.