If this had been a mere financial crisis, it would be over by now. The fact that we are suffering its fourth wave tells us there might be something at work other than merely financial euphoria and bad regulation. Maybe this is not a Minsky moment after all. Hyman Minsky, the 20th century US economist, formulated the long forgotten, and recently rediscovered, financial instability hypothesis, according to which capitalist economies, after a long period of prosperity, end up in a vicious circle of financial speculation. The Minsky moment is the point when what economists call this “Ponzi game” collapses.

But there might be better explanations. As the Bank of International Settlements said in its latest annual report, subprime might have been the trigger for this crisis, but not the cause. We do not have a full understanding yet of what happened but the BIS suggested that fast expansion of money and credit must have played a role. I would go further and say this is not primarily a crisis of financial speculation, but one of economic policy. Its principal villains are therefore not bankers, but economists – not in their role as teachers and researchers, but as policy advisers and policymakers.