标普500指数受困于关键博弈水平，这一冷门指数或将决定市场下一步走势
· cnbc.com
芝加哥的期权交易员和做市商在周五标普500基准指数跌破7500点时迅速逢低买入，但在指数反弹至该水平上方时也同样迅速地逢高抛售。
After a whipsaw two days of price action, bulls and bears are facing off again at a key technical level in the S&P 500 . At the same time, an increasingly popul...