... wegen dem Bargeld. Also wenn sie die Zinsen erhoehen will, wieso plagt sie dann dieses "serious problem"?

But the federal funds rate and other nominal interest rates cannot go much below zero, since holding cash is always an alternative to investing in securities...
This limitation is a potentially serious problem because severe downturns such as the Great Recession may require pushing real interest rates far below zero for an extended period to restore full employment at a satisfactory pace
http://www.federalreserve.gov/newsevents/speech/yellen20150924a.htm

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