Europe is, supposedly, fixed: between the upcoming one year anniversary of the 3 year LTRO, which has flooded the continent in excess €1 trillion of liquidity, and the OMP, which has supposedly backstopped sovereigns in perpetuity (even though the market has fully frontrun what now appears to be a massively unpopular political decision, as Spain has been demonstrating for the past 2 months), European bank liquidity needs are supposed to be fully taken care of. Yet something went bump on Halloween. As the ECB reports [6], borrowing on the prohibitive, and largely "last resort" ECB "Marginal Lending Facility" (whose rate is an usurious 1.50% [7]), one or more banks saw their need for EUR explode in the last day of the month, sending overall usage on this credit line to €7.8 billion, the most since mid-March, and a surge of over €7 billion overnight. What spooked European banks so much (whose liquidity needs are not month or quarter-end window dressing driven) that the ECB had to step in on top of everything else it has already done? We will surely find out soon.
Source: ECB [9]

