Bonds and debt: Negative yields are doing the opposite of what they were intended

``"It's the definition of insanity: Keep doing the same thing over and again and expect a different result. That's my assessment of central banks in a nutshell," said Kim Rupert, managing director of global fixed income analysis at Action Economics. "I never thought I'd say that. I had a lot of respect for central bankers. But they're getting way overindulgent with very little success as far as I can tell."''