IT’S fascinating that many Americans intuitively understood the outrage and frustration that drove Egyptians to protest at Tahrir Square, but don’t comprehend similar resentments that drive disgruntled fellow citizens to “occupy Wall Street.”

There are differences, of course: the New York Police Department isn’t dispatching camels to run down protesters. Americans may feel disenfranchised, but we do live in a democracy, a flawed democracy — which is the best hope for Egypt’s evolution in the coming years.

Yet my interviews with protesters in Manhattan’s Zuccotti Park seemed to rhyme with my interviews in Tahrir earlier this year. There’s a parallel sense that the political/economic system is tilted against the 99 percent. Al Gore, who supports the Wall Street protests, described them perfectly as a “primal scream of democracy.”

The frustration in America isn’t so much with inequality in the political and legal worlds, as it was in Arab countries, although those are concerns too. Here the critical issue is economic inequity. According to the C.I.A.’s own ranking of countries by income inequality, the United States is more unequal a society than either Tunisia or Egypt.