The U.S. economy is not immune to a relapse into recession. On the way back from his trip to Asia in eight days, Barack Obama told the television channel Fox News that "if we continue to burden the debt (public), people might lose confidence in the economy U.S., leading to a relapse into recession "(double dip recession is a double represented by a W). These comments follow a series of contradictory reports on the U.S. economy, where good business results contrast with the deterioration of unemployment and the deterioration of household confidence. The American authorities are hesitating less and less to express their concerns. Ben Bernanke, the Fed chairman, said Monday that interest rates near zero could be kept longer than expected. Wednesday is James Bullard, one of Fed officials in St. Louis, which found that raising rates might not occur before 2012.