BIGGEST ASSET AND CREDIT BUBBLE IN HISTORY COLLAPSES

Emmanuel Roman, of GLG Partners, said 25pc-30pc of the world's 8,000 hedge funds would disappear "in a Darwinian process", either going bust or deciding meagre profits are not worth their efforts.

"This will go down in the history books as one of the greatest fiascos of banking in 100 years," said Mr Roman, who co-runs London and New York-based GLG, a former division of Lehman Brothers Holdings with assets of $24bn (£14.8bn). "There need to be some scapegoats, and the regulators are going to go hunt people. That will be good in the long run."

His views were echoed by Professor Nouriel Roubini, a former US Treasury and presidential adviser known for his accurate prediction of financial crises, who estimated that up to 500 hedge funds would fail within months.

Both men were speaking at the same hedge fund conference in London on Thursday, and Prof Roubini said he would not be surprised if the US and other countries soon had to close their stock markets for more than a week to halt descent into "sheer panic".

The economist warned that the world is heading for a protracted recession that will end the US's financial dominance.

"It's the beginning of the decline of the US financial empire. The Great Depression ended in a massive war. I hope that's not going to happen but it's pretty ugly now," Prof Roubini said.

He added that turmoil over world trade, currency markets and debt is likely to cause geopolitical tensions between the Western world and emerging superpowers such as Russia, China and "a bunch of unstable oil states".

The conference saw analysts, economists and hedge fund managers discussing the possibility that global recession could now last two years on fears that government bail-outs and nationalisations have failed to stop the markets slumping.

"We're now paying the price for the biggest asset and credit bubble in history," Prof Roubini said, advising investors to stay clear of risky assets and keep their money in cash. "The bail-outs have not worked because the markets are no longer rallying, and the policy-makers have run out of options."