John writes, "For a while there, companies deemed to be highly risky were nonetheless able to borrow money for less than 6%. And borrow they did. Frackers, ultra-high-leverage retail chains and various other close-to-the-edge entities slurped up trillions from yield-starved investors who had forgotten about the other side of the risk/return equation. That this hasn’t worked out so well is not much of a surprise. But the speed with which it has gone bad is still breathtaking. The following chart from Bloomberg illustrates just how fast an illogical market can be brought back to reality."