That's not a common fiscal policy you are implying. A common fiscal policy consists of decisions about the collection and expenditure of taxes that have to be taken by a common institution and shared by the participating governments, thus EU must have a common tax-collecting agency like the US IRS for example.

Then Germany should better dissolve the European Union in the future if it isn't willing to have a common fiscal policy with the rest of the 26 EU member nation-states.

But when it comes to the proposal of bailing out southern European countries during the 2009-12 Euro crisis via fiscal stimulus, it was Germany and other northern European countries who opposed it and these southern European countries still suffer the negative effects of austerity.

Germany proves itself that in times of a European crisis, it is not capable of being the leader for the entire European Union.