It is odd to me that so many people are looking for some kind of abnormality which "caused" the crisis. Capitalism has had cyclical crises since its inception 300 years ago, so I would say that the crisis was not "caused" by either greed or stupidity, but is a naturally emergent behavior of the capitalist system.<p>Actually it is even more general than that. The pattern of exponential growth followed by die-off is common throughout nature - algal blooms, for example.<p>It seems that the whole discussion over the financial crisis has been warped and twisted by this absurd belief, in the face of all evidence, that the economy is in some sense "rational," that it has some kind of steady-state equilibrium, and that its problems are therefore caused by too little or too much regulation, too little or too much greed, etc.