Once upon a time if folks wanted to pinpoint the most economically-vulnerable country in Europe - the one most likely to face a crisis - they would invariably point to Greece or to Italy.

They were the nations with the eye-waveringly high bond yields, signalling how reluctant financiers were to lend them money.

Today, however, all of that has changed. The country invariably highlighted as Europe's problem child is France .

Indeed, look at the interest rates investors charge European nations and France faces even higher interest rates than Greece.

And these economic travails are central to understanding the political difficulties France is facing right now, with one prime minister after another resigning in the face of a parliamentary setback.

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French PM looks set to los

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