There was trouble anew when the stock markets opened on the first day of September; the Dow Jones industrial average quickly fell more than 350 points and into correction territory, CNBC reports. The New York Stock Exchange also invoked the little-used Rule 48 for its fourth time in two weeks in an effort to stabilize trading. Some key economic reports are expected later Tuesday, including data on construction spending and nationwide car sales, which could affect stocks, one way or the other.