Wall Street's Week Ahead: Dow Jones Industrial Average Plunges 300 Points As Economists Eye Jobs Report

U.S. stocks tumbled Monday, with the Dow Jones Industrial Average plunging as much as 350 points, after U.S. oil prices tumbled to their lowest level since 2009. Meanwhile, Brent crude, the global benchmark for oil prices, dropped below $55 a barrel for first time in more than five-and-a-half years.