U.S. shares tumble as Brent crude slips below $30 (Overshadowing Upbeat China Numbers)

``"There is a fear that the global economy and the U.S. economy as well could lapse into a recession given the fall in energy prices and greater economic weakness overseas," said Tim Ghriskey, chief investment officer of Solaris Asset Management in New York... "You have a lack of liquidity and incredibly negative sentiment out there," said Michael Holland, chairman of investment company Holland & Co in New York.''