Nikkei opened 0.47 percent lower in early Tokyo trading on Monday. At 9:15 a.m., the 225-issue Nikkei Stock Average was down 42.38 points, or 0.47 percent, at 9,008.84. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was down 3.32 points, or 0.44 percent, at 748. 77.