Please answer the following question after reading the materials. "On Dec. 16, the Federal Reserve's Federal Open Market Committee increased its benchmark federal-funds target rate for the first time in more than nine years. ... During this period of low interest rates, most banks have kept durations on their securities portfolios as short as possible in anticipation of FOMC rate increases." Question: Based on our discussion, could you provide detailed explanation on why banks have kept durations of their fixed-income security portfolios as short as possible during year 2015? What are the rationales? Please answer the following question after reading the materials. "On Dec. 16, the Federal Reserve's Federal Open Market Committee increased its benchmark federal-funds target rate for the first time in more than nine years. ... During this period of low interest rates, most banks have kept durations on their securities portfolios as short as possible in anticipation of FOMC rate increases." Question: Based on our discussion, could you provide detailed explanation on why banks have kept durations of their fixed-income security portfolios as short as possible during year 2015? What are the rationales