“In a monetary union, the basics of debt dynamics change as countries forgo monetary policy and exchange rate adjustment tools,” said the report. This would be amplified by a “vicious feedback between banks and sovereigns”, each taking the other down. That the IMF failed to anticipate any of this was a serious scientific and professional failure.

In Greece, the IMF violated its own cardinal rule by signing off on a bailout in 2010 even though it could offer no assurance that the package would bring the country’s debts under control or clear the way for recovery, and many suspected from the start that it was doomed.

The organisation got around this by slipping through a radical change in IMF rescue policy, allowing an exemption (since abolished) if there was a risk of systemic contagion. “The board was not consulted or informed,” it said. The directors discovered the bombshell “tucked into the text” of the Greek package, but by then it was a fait accompli.

The IMF was in an invidious position when it was first drawn into the Greek crisis. The Lehman crisis was still fresh. “There were concerns that such a credit event could spread to other members of the euro area, and more widely to a fragile global economy,” said the report.