High-debt countries may face the risk of self-fulfilling debt crises. If the public expects that in the future the government will be unable to roll over the maturing debt, they may refuse to buy debt today and choose to hold foreign assets. This lack of confidence may then be self-fulfilling....

A central tenet of the Maastricht Treaty is that a successful European Monetary Union requires sustainable public finances of its member states. Yet there is no clear definition of sustainability. The economist’s common use of the term builds on the concept of an intertemporal budget...