A slightly different perspective... if the banks hadn't messed up, some other aspect of the global economy would have eventually hit a downturn for which we were ill-equipped to withstand because we had 'an end to boom and bust' mentality and were operating a deficit in the deluded belief that the economy would only ever keep growing. The impending oil crisis in the ME, for example, is already knocking on to other areas, increasing oil prices, inflation, global instability and so forth. Sooner or later, growth phases always turn into decline phases. If anyone thought they were good at maths but turned out to be a duffer it was a certain G Brown esquire.