"China is now relying increasingly not just on net exports but on fixed investment" which has climbed to about 50 percent of GDP, he said. "Down the line, you are going to have two problems: a massive non-performing loan problem in the banking system and a massive amount of overcapacity is going to lead to a hard landing."
A record $2.7 trillion of loans were extended in China over two years, pushing property prices to all-time highs even as authorities set price ceilings, demanded higher deposits and limited second-home purchases.
The nation's current challenge is to maintain growth and curb price gains ahead of a leadership change next year, Roubini said. Officials may use administrative steps and price controls, as well as raising rates further and allowing currency appreciation, if inflation becomes a bigger problem, he said.
Political Transition
"The policy challenge through next year, where you have a delicate political transition of the leadership, is to maintain growth in the 8 to 9 percent range while pushing inflation below what it is right now," said Roubini, the co-founder and chairman of New York-based Roubini Global Economics LLC.
After next year, the bigger challenge in China is "to reduce fixed investment and savings and increase consumption. Otherwise after 2013, there will be a hard landing," he said.
The risk of "outright" deflation and the probability of another recession in the U.S. are lower now than a year ago, and output in Japan could rebound in the second half of the year, Roubini said two days ago. "High-grade" corporations have "very strong" balance sheets, he said.
Roubini in July 2006 predicted a "catastrophic" global financial meltdown that central bankers would be unable to prevent. The collapse of Lehman Brothers Holdings Inc. in 2008 sparked turmoil that led to the worst financial crisis since the 1930s.