U.S. markets finished July down 0.1%, according to Carson Group’s Ryan Detrick. He says years with declines in both June and July have historically seen weak pe

U.S. markets finished July down 0.1%, according to Carson Group’s Ryan Detrick. He says years with declines in both June and July have historically seen weak performance for the rest of the year; several memory-chip stocks are already down more than 20% from recent highs.