The euro zone has only small internal transfers, and its workers tend not to move far for work.

ECONOMIST: Charlemagne

The euro zone is showing the symptoms of an internal balance-of-payments crisis, with self-fulfilling runs on countries, because at bottom that is the nature of its troubles.

ECONOMIST: The euro

The Greek crisis only confirms the folly of binding a group of disparate countries together in a currency zone with no mechanism, such as a central fiscal authority, to address its internal imbalances.

ECONOMIST: Greece's sovereign-debt crunch