Economic growth has stalled and recovery may take longer than usual, former Federal Reserve chairman Alan Greenspan said on Monday.

"As of right now, U.S. economic growth is at zero," Greenspan said at an investment conference in Jeddah, Saudi Arabia's second-largest city. "We are at stall speed."

"Recovery might take longer to emerge than it usually does," he added.

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The longer growth stays at zero, the more likely the world's largest economy would start to contract, he said, adding that globalization of trade could ease some shocks.

"Growing globalization of trade and the economy would facilitate the absorption of shocks in the U.S.," he said.

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