To hear a number of prominent economists tell it, it doesn't look good for the US economy, not this year, not in 10 years.

Leading thinkers in the dismal science speaking at an annual convention offered varying visions of US economic decline, in the short, medium and long term. This year, the recovery may bog down as government stimulus measures dry up.

In the long run, the United States must face up to inevitably being overtaken by China as the world's largest economy. And it may have missed a chance to rein in its largest financial institutions, many of whom remain too big to fail and are getting bigger.

On the one hand, Harvard's Martin Feldstein said he believes the outlook for US economic growth in 2011 is less sanguine than many believe.

First, the boost to growth from government spending will be drying up this year, he said. Renewal of expiring tax cuts is no more than a decision not to raise taxes, and the impact of one-year payroll tax cut is likely modest, he said.

"There's really not much help coming from fiscal policy in the year ahead," he said. Woes from the dire situations of state and local governments may actually be a drag on growth, he said.

Growth got a lift from a lower saving rate in 2010, but that probably will not last this year as households worried about an uncertain future return to paring back debt and socking more away, Feldstein added. Discouraging declines in home values mean there is less to save from, he said.

"People are worried, so there's a strong reason for precautionary saving," he said.

On the other hand, there is the race with China and the dynamic Asian economies, including India. Most estimates put the size of the Chinese economy on par with the United States by the early 2020s, said Dale Jorgenson, also of Harvard.

Jorgenson sees Asian emerging markets as the most dynamic in the world, eclipsing other emerging market contenders such as Brazil and Russia with steady growth over the next decade.

"The rise of developing Asia is going to accompany slower world economic growth," he said.

The United States will need to come to terms with the fact that its prevalence in the world is fated to come to an end, Jorgenson said. This will be difficult for many Americans to swallow and the United States should brace for social unrest amid blame over who was responsible for squandering global primacy, he said.

MIT's Simon Johnson put it more bluntly, saying the damage from the financial crisis and its aftermath have dealt US prominence a permanent blow.

"The age of American predominance is over," he told a panel. "The (Chinese) Yuan will be the world's reserve currency within two decades."

Johnson said he believes the United States has failed to learn its lesson from the financial crisis and continues to implicitly back its largest financial institutions.

"I'm concerned about the excessive power of the largest global banks," he said. "Who are the government-sponsored enterprises now? It's the six biggest bank holding companies."

To be sure, Raghuram Rajan, a former IMF chief economist now with the University of Chicago's Booth School of Business, could still envision an ongoing US leadership role.

Nothing proceeds in a straight line, he said, and there are many pitfalls along the way even for dynamic Asian economies.

"I would say the age of American dominance may be nearing an end. But America as the biggest mover will be in place for a long time," he said.

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