Last week, the Federal Reserve decided to keep US interest rates unchanged, marking its 96th month of life at the zero bound. Apparently, for all of its "data dependence", the Fed feels the economy could still benefit from *just* a little more of its ZIRP happy juice. But as anyone with a little common sense will tell you, More is not always better. It's quite possible to have too much of a good thing. And in its pursuit to kick the can for a little longer, the Fed has crossed a dangerous line.