U.S. President Barack Obama shakes hands before speaking about the economy during a visit to Hudson Valley Community College in Troy, New York, September 21, 2009. REUTERS/Kevin Lamarque   (UNITED STATES POLITICS BUSINESS)By Alister Bull

WASHINGTON (Reuters) – The United States wants world leaders to agree this week to launch a major rethink of the world economy in November as they try to strengthen the global economy after its near meltdown.

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