The eurozone’s creeping fragmentation is primarily the result of the mutual dependence of banks and governments. In the eurozone, banks are vulnerable to sovereign-debt crises because they hold a lot of government bonds – frequently issued by their country of origin. Governments, for their part, are vulnerable to bank crises because they are individually responsible for rescuing national financial institutions. Each episode in the current crisis illustrates the fragility caused by this interdependence.
via Three Ways to Save the Eurozone – Jean Pisani-Ferry – Project Syndicate.