Taking Greece out of the euro would force it to adopt its old currency again, the drachma.
The disciplines of the euro may force the French to change despite themselves.
This threat has considerable power for that continued survival of that very euro is the driving force of much European politics.
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As for the eurozone in the round, Mr Diamond believes there is no probability of the currency union disintegrating and he stresses that a strong euro would be a force to promote global prosperity.
The chief reason: Germany, the world's third-largest economy--and the driving force behind the euro's performance--is struggling.
If European governments want the rationalising force of the euro to shake up and improve their companies, they must dismantle the barriers still in the way.
It is the only organisation likely to force a rethink of the euro zone's failed strategy towards Greece, Ireland and Portugal.
Even if it is put to a vote, it will come into force when 12 of the euro zone's 17 approve it.
Without a deal by Monday night, the tiny Mediterranean island nation of about 1 million would have faced the prospect of bankruptcy, which could force it to abandon the euro currency and spur turmoil in the eurozone of 300 million people.
By refusing to disburse the next 12bn-euro tranche of last year's 110bn-euro bailout, the Fund had hoped to force eurozone ministers' hands.
Ahead of the vote, supporters said approving the treaty would help ensure financial stability in Ireland, warning that a rejection could lead to a renewed banking crisis and potentially force the nation out of the euro currency union.
It accounts for one percent or so of Euro-zone gross domestic product and its labor force is one of the least productive on the continent.
Unemployment remained steady in the euro area at 8.3% of the labour force in June.
At Euro 2000 the Dutch police handled fans superbly but the Belgian force was heavy-handed and the tournament failed as a result.
Still, some academics say with increasing force that too rigid an approach to adopting the euro may not suit small, open economies, such as those of Estonia, Lithuania or even Hungary.
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It now remains to be seen whether the Irish Government's decision will force the GAA into a re-think over the Euro 2008 issue.
There have been suggestions that the Government might use the funding issue as a lever to force the GAA to make Croke Park available for the Euro 2008 bid.
"The strong euro and the persistent dislocations in the money and credit markets will likely force the ECB to keep rates on hold for the foreseeable future, " said Holger Schmieding from Bank of America.
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And it expects Britain's unemployment rate to be 5.4% of the labour force in 2003, compared with 8.8% in the euro area.
Without necessary reforms, eventually this vicious circle of stagdeflation would force Italy to exit EMU, return to the Lira and default on its Euro debts.
Foreign Secretary David Miliband told Adam Boulton on Sky there were only a few "rites of passage" needed before the Lisbon Treaty came into force and accused Mr Cameron of "dithering" because he did not "want to take on the euro extremists" in his party.
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