After years of acquiescence, the markets have started to ask whether the euro zone has the machinery to launch a Paulson-style rescue in a fast-moving crisis. Who has the authority to take charge? The ECB is not allowed to bail out countries under EU treaty law. The Stability Pact bans the sort of fiscal blitz that has kept America afloat. Yes, treaties can be ignored. But as we are learning, a banking system can implode in less time than it would take for EU ministers to congregate from the far corners of euroland.