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PARIS (AP) — European leaders rushed Monday to stop a rampaging debt crisis that threatened to shatter their 12-year-old experiment in a common euro currency and devastate the world economy as a result.

See also: Euro Debt Crisis May Cause Global Economy To ‘Face The Worst’

One proposal gaining prominence would have countries cede some control over their budgets to a central European authority. In a measure of how rapidly the peril has grown, that idea would have been unthinkable even three months ago.

World stock markets, glimpsing hope that Europe might finally be shocked into stronger action, staged a big rally. The Dow Jones industrial average in New York rose almost 300 points. In France, stocks rose 5 percent, the most in a month.

More relevant to the crisis, borrowing costs for European nations stabilized. They had risen alarmingly in recent weeks – in Greece, then in Italy and Spain, then across the continent, including in Germany, the strongest economy in Europe.

The yields on benchmark bonds issued by Italy and Germany rose, but only by hundredths of a percentage point. The yield fell 0.1 percentage point on bonds of France, 0.14 points for those of Spain and 0.22 points for Belgium.

Allowing a central European authority to have some control over the budgets of sovereign nations would create a fiscal union in Europe in addition to the monetary union of the 17 countries that share the euro currency.

Some analysts have said would be a leap toward creating a United States of Europe. More delicately, it would force the nations of Europe to swallow their national pride, cede some sovereignty and agree to strengthen ties with their neighbors rather than fleeing the euro union during the crisis.

“The common currency has the problem that the monetary policy is joint, but the fiscal policy is not,” Germany’s finance minister, Wolfgang Schaeuble, said in a meeting with foreign reporters in Berlin.

The monetary union has existed since the euro was created in 1999, but the European Union, which includes the 17 euro nations and 10 others that use their own currencies, has no central authority over taxing and spending.

Countries like Ireland, Portugal, Spain, Greece and Italy overspent wildly for years and racked up annual budget deficits that have left them with monstrous debt. Italy holds euro1.9 trillion in debt, or 120 percent of the size of its economy.

A fiscal union could prevent excessive spending in the future. More important, it would be a step toward addressing today’s debt crisis: It could provide cover for the European Central Bank to stage a massive intervention in the European bond market to drive down borrowing costs and keep the debt crisis under control.

Enforced budget discipline might ease the ECB’s concerns about the concept known as moral hazard – essentially, that bailing out free-spending countries would only encourage them to do it again.

A fiscal union would also pose a practical problem – how to make such a body democratically accountable.

Another option is for the 17 nations in the euro group to sell bonds together, known as eurobonds, to help the countries in the deepest trouble because of debt. Germany has resisted such a plan, because it would raise borrowing costs for it and other nations that good credit ratings.

While Europe buzzed over the possible solutions, finance ministers of the euro nations prepared for a summit beginning Tuesday evening in Brussels, to be joined the following day by ministers from the rest of the European Union.

Italy readied an auction of bonds designed to raise euro8 billion, or about $10.6 billion – and steeled itself for the high interest rates it will have to pay.

In Washington, President Barack Obama huddled with European Union officials, and the White House insisted Europe alone was responsible for fixing its debt problems.

While Obama offered no specifics on how the U.S. might help, he said failing to resolve the debt crisis could damage the U.S. economy, which has grown slowly since the end of the recession in June 2009 and still has 9 percent unemployment.

“If Europe is contracting, or if Europe is having difficulties, then it’s much more difficult for us to create good here jobs at home,” Obama said at the conclusion of the day-long summit.

The euro appeared to be in increasing danger. Experts said the currency could fall apart within days without drastic action, with consequences rivaling those of the 2008 financial crisis.

“Everyone knows that if the eurozone crashes the consequences would be very dramatic and in the race after that there would no winners, just losers,” said Finland’s finance minister, Jutta Urpilainen.

For countries that decided to leave the euro group and return to their own sovereign currency, the conversion would be wrenching.

If Germany broke away, for example, its national currency could rise in value quickly because the German economy is stronger on its own than the European economy as a whole. But a stronger German mark would damage the German economy because Germany depends heavily on exports, and it would cost more for everyone else to buy German goods.

As for weaker countries that decided to leave, depositors would probably yank money out of their banks, fearing a plummeting currency. Savers would not want their euros replaced with, say, feeble Greek drachmas.

If countries tried to repay their old euro debts with their own currencies, they’d be considered in default and struggle to sell bonds in global financial markets. Corporations would face the same squeeze.

Overall, economists at UBS estimate, a weak country that left the eurozone would see its economy shrink by 50 percent.

Currency chaos and defaults by governments and companies would weaken European banks and also cause them to stop lending to each other. Because banks are connected globally, a credit freeze in Europe would spread. As it did in 2008, a credit freeze would cause stock markets to sell off worldwide, and another deep recession would probably follow.