Timothy Geithner, U.S. treasury secretary, arrives for a Senate Banking Committee hearing in Washington, D.C., U.S., on Thursday, Sept. 16, 2010. Geithner said China needs to allow a "significant, sustained" rise in its currency as lawmakers called for the U.S. to toughen its stance on the yuan. Photographer: Jay Mallin/Bloomberg

Photo by: Jay Mallin

Timothy Geithner, U.S. treasury secretary, arrives for a Senate Banking Committee hearing in Washington, D.C., U.S., on Thursday, Sept. 16, 2010. Geithner said China needs to allow a "significant, sustained" rise in its currency as lawmakers called for the U.S. to toughen its stance on the yuan. Photographer: Jay Mallin/Bloomberg