S&P 500 ends down, Big Tech lifts Nasdaq to record
* Indexes end: S&P 500 -0.34%, Nasdaq +0.07%, Dow -0.76%. The S&P 500 closed lower on Tuesday while the Nasdaq edged up to a record high, as investors balanced worries about the slowing pace of economic recovery with expectations that the Federal Reserve will maintain its accommodative monetary policy.Amgen Inc fell 2.2% and Merck & Co lost 1.7% after $Morgan Stanley$ cut its rating on the stocks to "equal-weight" from "overweight.". The Nasdaq was supported by Big Tech stocks that have fueled W