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Are we about to enter a third, and this time fatal, leg of the financial crisis? The problems of euroland which have so unsettled markets this week – and in particular those of Portugal, Ireland, Greece and Spain (the "pigs", as they have become known in financial circles) – are worrying enough in themselves.

But they are also a proxy for much wider concern about how national governments extract themselves from the fiscal and monetary mire they have created in fighting the downturn. It's proving messy, though, and they are running the risk of provoking an even worse crisis in the process.

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