Digging into the details of the Fed's balance sheet can sometimes be a thankless task but Charles Biderman and Jim Bianco have some fascinating insights into where the real money is being hidden. The stability of the Fed's balance sheet post-QE2, given we are borrowing-and-spending over $100bn per month is all down to Operation Twist and the Fed's creation of demand at the short-end (via telling banks that rates will be low forever and 'guaranteeing' positive carry returns on rolling overnight repo) and using this 'cash' to almost entirely fund longer-term borrowing. In a simple primer of the Fed's implicit risk-free carry trade, the two chaps note that the only downside is too much growth or inflation which would cause a massive unwind of these positions (leading only to further bailouts). Critically though, they explain the fact that Operation Twist (and its implicit off-balance-sheet funding of this risk-free carry trade) is nothing more than the Fed's version of the ECB's LTRO - as the banks are 'encouraged' to buy short-term government debt with risk-free-carry expectations - implying the Fed's balance sheet could in fact be considerably larger than it appears. Yet more ponzinomics explained in a simple way - that surely eventually will trickle down to the masses who will question the emperor's clothing.