For later
http://2.bp.blogspot.com/-Yg3q6DyL5Is/TpAMBVy2VuI/AAAAAAAAB_0/VkPbtagwafM/s1600/FRED%2BAMBSL%2BBERNANKE%2BFIX.png
Bernanke is a student of the Great Depression and is repeating that monetary policy hoping it works again.
Thing is, it ( keynesianism) didn`t work the first time.