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Traders look at computer screens as they work on the floor of the New York Stock Exchange.
Traders work on the floor of the New York Stock Exchange.
  • US stocks dropped Tuesday, starting off a new month lower after July's big rally.
  • Dow stocks Merck and Caterpillar rose after reporting strong quarterly earnings.
  • Later on Tuesday, the Labor Department will release job openings data, and ISM will publish its manufacturing activity index.

US stocks dropped Tuesday, starting off a new month lower after July's big rally, as fresh earnings reports rolled in and the 10-year Treasury yield topped 4% again.

Last month, the Dow Jones Industrial Average climbed 3.3%. Meanwhile, the Nasdaq Composite rose 4%, and the S&P 500 gained 3.1%, as both notched their fifth consecutive monthly advance.