The U.S. stock market had another up-and-down day, which has been the norm so far in the historically volatile month of September. The majority of equities opened the day trading higher, until mixed statements from a few central bank speakers caused a midday selloff that lasted into the early afternoon in New York. The roughly 2:00 PM turnaround can be mostly attributed to surprisingly good news from OPEC, which was reported to have reached a cap deal to limit oil output. By the closing bell, all three major market indexes had registered full-day gains, with the Dow Jones Industrial Average leading the pack with a 111 point surge.