As John Maynard Keynes is alleged to have said: “When the facts change, I change my mind. What do you do, sir?” I have changed my mind, as the panic has grown. Investors and lenders have moved from trusting anybody to trusting nobody. The fear driving today’s breakdown in financial markets is as exaggerated as the greed that drove the opposite behaviour a little while ago. But unjustified panic also causes devastation. It must be halted, not next week, but right now.