Jeff Madrick writes: With early Tuesday’s abrupt evacuation of Zuccotti Park, the City of New York has managed—for the moment—to dislodge protesters from Wall Street. But it will be much harder to turn attention away from the financial excesses of the very rich—the problems that have given Occupy Wall Street such traction. Data on who is in the top 1 percent of earners further reinforces their point. Here’s why.

Though the situation is often described as a problem of inequality, this is not quite the real concern. The issue is runaway incomes at the very top—people earning a million and a half dollars or more according to the most recent data. And much of that runaway income comes from financial investments, stock options, and other special financial benefits available to the exceptionally rich—much of which is taxed at very low capital gains rates. Meanwhile, there has been something closer to stagnation for almost everyone else—including even for many people in the top 20 percent of earners.

This may seem counterintuitive at first. After all, analysts have long painted a picture of growing inequality over the past few decades in which the top quintile’s share of the national income has risen while the share of the other 80 percent has fallen. But almost all the gains for the top 20 percent was for the top 1 percent. And half of that is accounted for by a tiny group within the top percent—those earners in the top 0.1 percent. Meanwhile, for the four quintiles below the 80 percent level, the share of total income fell significantly. For those from the 80th to the 99th percentile, the share rose only slightly (a little more rapidly as you go higher up).

In other words, Occupy Wall Street’s claim that “We are the 99 percent” is dead on right.