In the past, whenever the financial system came close to a breakdown, the authorities rode to the rescue and prevented it from going over the brink. That is what I expected in 2008 but that is not what happened. On Monday September 15, Lehman Brothers, the US investment bank, was allowed to go into bankruptcy without proper preparation. It was a game-changing event with catastrophic consequences.

For a start, the price of credit default swaps, a form of insurance against companies defaulting on debt, went through the roof as investors took cover. AIG, the insurance giant, was carrying a large short position in CDS and faced imminent default. By the next day Hank Paulson, then US Treasury secretary, had to reverse himself and come to the rescue of AIG.