Germany’s Bundesbank is not afraid of playing the role of bad fairy. Last year it opposed the European Central Bank’s scheme for buying potentially unlimited quantities of sovereign bonds – a promise which ended the hot phase of the euro crisis. Last week, it criticised rules that encourage euro zone banks to load up on their own governments’ debts.
Jens Weidmann, the Bundesbank president, is right to put this topic on the agenda. After all, the exposure of banks to governments is one half of what has been dubbed the “sovereign-bank doom loop.” When governments such as Greece got into trouble, they dragged their banks down as well. (The other half of the doom loop involves troubled banks dragging down their governments.)
The problem is how to break this loop without triggering a new crisis in vulnerable countries such as Italy and Spain. After all, if their banks were suddenly told to cut their holdings of Italian and Spanish bonds, Rome and Madrid would be hard-pressed to fund themselves.
Weidmann mentioned two rules that encourage banks to load up on government debt in an article in the Financial Times.
First, banks’ holdings of sovereign debt are exempt from the so-called “large exposures regime.” This says banks are not allowed to lend more than a quarter of their eligible capital to any single counterparty. The basic principle is lenders are less likely to get into trouble if they don’t have too many eggs in one basket.