"The world is not going back to normal after the magnitude of what they have done.
The bank said the damage caused by the financial excesses of the last quarter century was forcing the world's authorities to take steps that had never been tried before.
This gamble was likely to end in one of two extreme ways: with either a resurgence of inflation; or a downward spiral into depression, civil disorder, and possibly wars. Both outcomes will cause a rush for gold.
"They are throwing the kitchen sink at this," said Tom Fitzpatrick, the bank's chief technical strategist.
"The world is not going back to normal after the magnitude of what they have done. When the dust settles this will either work, and the money they have pushed into the system will feed though into an inflation shock.
"Or it will not work because too much damage has already been done, and we will see continued financial deterioration, causing further economic deterioration, with the risk of a feedback loop. We don't think this is the more likely outcome, but as each week and month passes, there is a growing danger of vicious circle as confidence erodes," he said.
"This will lead to political instability. We are already seeing countries on the periphery of Europe under severe stress. Some leaders are now at record levels of unpopularity. There is a risk of domestic unrest, starting with strikes because people are feeling disenfranchised."
