RBS cries 'sell everything' as deflationary crisis nears

"China has set off a major correction and it is going to snowball. Equities and credit have become very dangerous, and we have hardly even begun to retrace the 'Goldlocks love-in' of the last two years," he said.

Mr Roberts expects Wall Street and European stocks to fall by 10pc to 20pc, with even an deeper slide for the FTSE 100 given its high weighting of energy and commodities companies. "London is vulnerable to a negative shock. All these people who are ‘long' oil and mining companies thinking that the dividends are safe are going to discover that they're not at all safe," he said.

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RBS forecast that yields on 10-year German Bunds would fall time to an all-time low of 0.16pc in a flight to safety, and may break zero as deflationary forces tighten their grip. The European Central Bank's policy rate will fall to -0.7pc.

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Larry Summers, the former US Treasury Secretary, said it would be a mistake to dismiss the current financial squall as froth. Markets often sense a gathering storm when policy-makers are still asleep at the wheel. He has long argued that the world economy is so far out of kilter that it takes permanent financial bubbles to keep growth going, an inherently unstable structure.