Wall Street is mixed and holding a bit steadier after its third straight losing week amid its dismal August. The S&P 500 was up 0.4% Monday. The Dow was down 22 points, and the Nasdaq composite was 0.8% higher. In the bond market, the 10-year Treasury yield rose again to near its highest level since 2007. The relatively quiet trading followed a mixed performance for markets worldwide. The week’s main event is likely to be a speech on Friday by Federal Reserve Chair Jerome Powell. The Jackson Hole, Wyoming, setting has been the home of major policy announcements in the past by the Fed.