The third problem for the ECB will come if capital drains from Italian banks. In that case the ECB could in theory claim a clear need to intervene to prevent damage to eurozone banks outside Italy. But, again, there could be pressure to stay on the sidelines. Under the Target2 system, which is the way eurozone central banks keep account of liabilities to each other, Italy already owes £442bn. Any ECB-backed support for its banks would see that figure rise further, provoking fears over repayment. Note that Target2 imbalances are already a hot topic in Germany, where the Bundesbank is the single biggest creditor.