"The US is going into recession," he said.
"They (the Federal Reserve) have a lot more work to do.
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They could cut their policy short-term interest rate by one to one-and-a-half percentage points over the next nine to 12 months."
Roach, who is chairman of the investment bank and trading firm's Asian arm, said it was wrong to think that the rapidly developing economies of China and India could fully compensate for a US recession.
"What is interesting, and potentially disturbing, is that the rest of the world just doesn't think this is a big deal any more," he said of the potential of a US recession.
"There is a view that the world is somehow decoupled from the American growth engine.
"I think that view will turn out to be dead wrong, and this is a global event with consequ