U.S. stock futures decline sharply on Thursday, as worries about Lehman Brothers and other macroeconomic conditions continued to take their toll. S&P 500 futures fell 12.1 points to 1,221.20 and Nasdaq 100 futures dropped 19.25 points to 1,718.25. Dow industrial futures dropped 94 points. The dollar was sharply lower against the Japanese yen. Wall Street has been massacred this week, as Lehman Brothers was the most recent investment bank to show signs of collapse. One analyst, Michael Hecht, estimated that the brokerage will need an additional $6 billion of common equity. Wall Street will wait on Thursday for figures on the July trade balance, August import prices and weekly jobless claims.