By Michael Gerson
The good news: On every rung of the economic ladder, median income has gone up — not equally, but significantly. Even among the bottom 20 percent, income rose 74 percent between the two generations. Liberals need to accommodate the fact that the poor have not gotten poorer. The benefits of economic growth have been shared.
But relative mobility — the chance of rising to a higher income quintile — is stalled, particularly near the bottom.