As the “dog days” of summer drag on, trading continues to be relatively light. Oil prices fell at the beginning of last week amid rumors that Iraq may up its oil exports, prompting stocks to retreat. While stocks rallied midweek, they sunk by the close of trading last Friday following Federal Reserve Chair Janet Yellen’s intimation that short-term interest rates could be in line for an increase sooner rather than later. Of the indexes listed here, only the Russell 2000 didn’t lose ground. The Dow, S&P 500, and Nasdaq suffered their largest losses since the week of the Brexit vote in June.