But euro-zone members would probably have to take a big hit on loans to the country and banks could face heavy losses on their exposure to the Greek economy.

Contingency planning is ramping up on the corporate side, too. One European supermarket group has been looking closely at its suppliers’ financing requirements. “The key thing for them is how their working capital cycle is funded and whether they can get access to the banks that they normally would use, which may themselves be in a liquidity squeeze,” a treasury official at the company tells CFO European Briefing. “Our job is to ensure the channels of liquidity are open. If we can keep that going, a lot of the disruption can be minimized relatively quickly.”

Meanwhile, some portfolio managers are dumping debt of southern European countries, while others are piling into U.S. and German issues,

Even as the mainstream media warned that Hollande's populism would be punished by the bond markets, the IMF's chief economist, Frenchman Olivier Blanchard — who is closer to Hollande's heterodoxy than might be expected — confessed that "schizophrenic" investors are now as scared by the impact of austerity on growth as they are of fiscal largesse.

"With zero growth and rising interest costs in Spain and Italy, no debt is sustainable," Fitoussi said. "Even France will be challenged if it goes into recession."

which, despite their recently elected conservative governments, are aware that only pan-European investment, eurobonds and the full support of the ECB can save the eurozone.