Wall Street flat as Santa rally falters

NEW YORK (Reuters) - Stocks fluctuated between small gains and losses in a light-volume session on Tuesday, suggesting a 5 percent rally over the past four trading sessions may have largely run its course. The S&P 500 turned positive for the year on Friday, with improving economic data helping to boost equities. The gains, which lifted the benchmark index above its 200-day moving average, were amplified by the light pre-holiday trading. Doug Roberts, chief investment strategist at Channel Capital Research. ...