The euro system has many peculiarities as we have shown extensively on our blog. To a large extent the system can be analyzed as a “tragedy of the commons” problem. As is well known in economics, when a shared resource can be exploited in full by individuals with no exclusive property right, the resource will be overexploited.
The euro is a shared resource. Every national central bank can exploit it to the fullest while the cost will be shared by every member state.
The incentive in such a system is obviously rigged to its disfavor and it will eventually break down.