Moreover, this central bank sponsored regime of ZIRP and money market pegging contains a built-in accelerator. As carry trade speculators drive asset prices steadily higher and fixed income spreads steadily thinner—- fear and short interest is driven out of the casino, making buying on the dips ever more profitable and less risky. Indeed, the explicit promise by central banks that the money market rate will remain frozen for the duration and that ample warning of any change in rate policy will be "transparently" announced is the single worst policy imaginable from the point of view of financial stability. It means that the speculator's worst nightmare—–suddenly going "upside down" due to a sharp spike in funding costs—-is eliminated by central bank writ.