Shares of other Apple suppliers including Qualcomm QCOM.O, Broadcom AVGO.O, Qorvo QRVO.O and Corning GLW.N ended lower. Investors will look for clues on whether inflation is continuing to ease following the Labor Department's consumer price index (CPI) report on Wednesday. "Overall, it's a relatively mild day, but both the debt ceiling as well as the inflation are causing some anxiety," said Randy Frederick, managing director of trading and derivatives at the Schwab Center for Financial Research.