There are always those fearful of a stock-market crash, but rarely have there been so many. From the bowels of public-sector reports to the musings of private-sector titans, the usual doomsayers have been joined by a multitude of loudening voices. There is certainly a bubble in bubble talk. Katie Martin captured the angst especially well recently in the Financial Times. “The latest missive from the IMF last week was bracing,” she wrote, citing a report which had stated: “Valuation models show risk asset prices well above fundamentals, raising the risk of sharp corrections. Markets appear complacent as the ground shifts.”…