. see note 3 to the consolidated financial statements on page 136 for a more detailed discussion . 2007 vs . 2006 revenues , net of interest expense improved primarily due to improved treasury results and a gain on the sale of certain corporate-owned assets , partially offset by higher inter-segment eliminations . operating expenses increased primarily due to restructuring charges , increased staffing , technology and other unallocated expenses , partially offset by higher inter-segment eliminations