David Rosenberg in Business Insider.

Through its actions, the Fed creates excess reserves in the banking system. But with one-third of the household sector gripped with a sub-620 FICO score, 1-in-7 mortgage debtors are either in arrears or in the foreclosure process, and with an estimated 25% of homeowners ” upside down” in their mortgage (negative equity), there is at least some non-trivial probability that, as was the case with QE1, there will be no visible impact on the willingness to borrow, the money multiplier or velocity, which is what we would need to see to declare this radical policy experiment a success.