Last year, when oil prices surged, the Iranian economy could shrug off its problems. With oil's steep decline and the global financial crunch, though, some fear social unrest. Many factories are months behind on salaries, says Ali Reza Mahjoub, a member of Parliament and head of Workers' House, a labor group. He estimates that unemployment, officially 12.5 oercent, is really closer to 17 oercent. As financing dries up, building is grinding to a halt, says developer Amir-Mohamad Mazaheri. "This is a very dangerous situation," he says, puffing on a cigarette in a new tower in North Tehran. "There will be 3-4 million construction workers looking to any activity to support themselves."