[ppereira]

The mobility between quintiles is not particularly interesting; it is far too coarse a measure. The changes in inequality that we see in the US, Canada, and the UK affect the relative earning capacity of the bottom 90% vs. the top 10%, with the 90th percentile being an inflection point at our levels of inequality.

The relevant reduction in mobility would primarily be within the top 10% tail of the Pareto distribution for income, the dynamics of the bottom 90% are quite different -- although their absolute share vs. the top 10% has certainly declined.