The downbeat warning came as Mr Obama unveiled his economic "dream team" to help him confront the global economic problems. Wall Street responded favourably with its biggest two-day rally in 21 years. The Dow Jones climbed 396.97 points, or 4.9 per cent, to 8,443.39. The surge was partly in response to the earlier announcement of a $20billion bail-out of the Citigroup banking group.