The European Economic and Monetary Union (EMU) and the euro are about to celebrate their 10th anniversary. The euro was introduced without serious problems and has since functioned well, with the European Central Bank (ECB) delivering the low inflation that is its sole mandate.

But the current economic crisis may provide a severe test of the euro's ability to survive in more troubled times. While the crisis could strengthen the institutions provided by the EMU, it could also create multiple risks, of which member countries need to be aware if they want to avoid them.

The primary problem is that conditions in individual EMU members may develop in such different ways that some national political leaders could be tempted to conclude that their countries would be better served by adopting a mix of policies different from that of the other members.