In a speech this afternoon, Fed Chair Yellen surprised investors with a potential new twist on U.S. monetary policy. Yellen put forth the possibility that a “high-pressure economy may be the best approach to repair the damage done during the financial crisis. This would involve waiting longer in the business cycle than in the past to raise the federal funds rate. She acknowledged that this approach would run the risk of inflation rising above their 2% target level. Some of the hoped for goals of this twist for longer loose monetary policy would be to encourage business investment and to increase the number of workers who return to the labor force. The possibility of Fed policy which tolerates higher inflation caused long-term bond yields, including MBS, to rise.