I'm Peter Shack now. CNBC. Wall Street has concluded a losing week, but the stock market did cut a chunk of its losses with a modest Friday rally.The Dow gained 518 points to close at 53,277. The S&P 500 rose 4/10en of a percent or 33 points. And the Nasdaq also rose 4/10en of a percent adding 113 points.The Dow actually had its best day since August 4th, although 229 points of its gain came from one stock, Goldman Sachs. This week's volatility notwithstanding, Jim Lamp, senior portfolio management director ...