High-volume losers were American Electric Power Co. Inc. ( AEP ), Exelon Corp. ( EXC ), and Southern Co. ( SO ). Investors are very excited about Tuesday's earnings report from the maker of the iPhone. In addition to gains received by the tech rally and China's rate announcement, traders were also enthused by word the European Central Bank is poised to loosen monetary policy and boost its bond-purchasing program in order to prevent ongoing deflationary pressures.