I believe that the Fed has overreached in its monetary policy not just in response to the latest crisis, but pretty consistently over the 15-20 years. In an effort to lessen the effects of (inevitable) economic downturns, the Fed (and other central banks) has caused extreme financial distortions and dislocations.
It's a sensational breakthrough involving not only our cosmic origins, but also the nature of space: by producing the first-ever detection of Hawking radiation (the process by which inflation's rapid doubling generates these gravitational waves), the BICEP2 team has found the first experimental evidence for quantum gravity.
Changes in the structure of the economy have led to a significant shift in the natural balance between savings and investment, causing a decline in the equilibrium or normal real rate of interest that is associated with full employment. In this situation, a temporary increase in fiscal stimulus reduces, rather than increases, the long-run debt-to-GDP ratio.Anything that stimulates demand will operate in a positive direction. Austerity is counterproductive unless it generates so much confidence that it is a net increaser of demand.