Banks Build Contingency for Breakup of the Euro

PARIS — For the growing chorus of observers who fear that a breakup of the euro zone might be at hand, Chancellor Angela Merkel of Germany has a pointed rebuke: It’s never going to happen.

But some banks are no longer so sure, especially as the sovereign debt crisis threatened to ensnare Germany itself this week, when investors began to question the nation’s stature as Europe’s main pillar of stability.

On Friday, Standard & Poor’s downgraded Belgium’s credit standing to AA from AA+, saying it might not be able to cut its debt load any time soon. Ratings agencies this week cautioned that France could lose its AAA rating if the crisis grew. On Thursday, agencies lowered the ratings of Portugal and Hungary to junk.

While European leaders still say there is no need to draw up a Plan B, some of the world’s biggest banks, and their supervisors, are doing just that.

“We cannot be, and are not, complacent on this front,” Andrew Bailey, a regulator at Britain’s Financial Services Authority, said this week. “We must not ignore the prospect of a disorderly departure of some countries from the euro zone,” he said.

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