DAVOS, Switzerland -- Is the euro crisis over? A leading U.S. economist says not by a long shot.

Even as the head of the European Central Bank talked Friday of “positive contagion” in the markets and predicted an economic recovery for the recession-hit eurozone later this year, economist Barry Eichengreen warned that the debt crisis that has shaken Europe to its core could easily erupt again this year unless European leaders move faster to solve their problems.

While European governments and markets have been breathing easier in recent months after years of turmoil, it’s no time for complacency, said Eichengreen, a professor at the University of California - Berkeley who has chronicled the Great Depression and explored the consequences of a breakup of the euro currency.

“Nothing has been resolved in the eurozone, where markets have swung from undue pessimism to undue optimism,” Eichengreen told The Associated Press in an interview at the World Economic Forum in Davos, Switzerland, an annual gathering of corporate and government leaders. “They said all the right things last year … and they’ve been backtracking ever since.”

He urged eurozone leaders follow up on its proposals to steady its banking system and keep failed banks from adding to government debt through expensive bailouts.

European leaders in Davos this week are seeking to reassure investors and corporate leaders that the continent is on the mend after its punishing debt crises.

European Central Bank chief Mario Draghi on Friday forecast a recovery in the eurozone economy in the second half of the year, and spoke of “a new restored sense of relative tranquility” and “positive contagion on the financial markets.”

But he acknowledged “we don’t see this being transmitted into the real economy yet.”