The central-bank put lives on. Policy makers deny its existence, yet investors still reckon that whenever stocks and other risk assets take a tumble, the authorities will be there with calming words or economic stimulus to ensure the losses are limited. A put option gives investors the right to sell their asset at a set price so the theory goes that central banks will ultimately provide a floor for falling asset markets to ensure they don’t take economies down with them. Last week as markets swooned again, it was St. Louis Federal Reserve President James Bullard and Bank of England Chief Economist Andrew Haldane who ... (full story)