Here is why for the 2013 edition of "attempt to decouple reality from stocks (and fail every time)", the global central banks realized that just the Fed (2011), and/or just the Fed and the ECB (2012) would not be enough. Thus, welcome Japan and your unsterilized $75 billion per month, and lots and lots of prayer that third time will be the charm to enable the "market" finally to break free from the tyrrany of evil fundamentals, macro factors and, generally, reality.
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