US economy is in goldilocks.
The three years since 2009 have seen three programs of Quantitative Easing (QE) and each of the years 2010, 2011, and 2012 has logged an annual real growth rate of around 2%. Unemployment has steadily fallen from around 9.8% to 7.5%, approximately at the rate of about 0.2% every 3 months, creating on average about 150,000 jobs every month since January 2010. Inflation has remained in the range of 1% to 2% every year.
The summary is QE, 2% annual real growth rate, steadily declining unemployment and inflation within target.
When viewed from outside the box of conventional monetary policy, one would be compelled to observe that ultra-loose monetary policy may indeed be the neutral rate of interest.