Professor Roubini, of New York University's Stern business school, believes that while such a major change is some way off, the Chinese government is laying the ground for the yuan's ascendance.

Known as "Dr Doom" for his negative stance, Prof Roubini argues that China is better placed than the US to provide a reserve currency for the 21st century because it has a large current account surplus, focused government and few of the economic worries the US faces.