S&P 500 指數陷入關鍵攻防戰。這項冷門指數可能決定市場下一步走勢
· cnbc.com
芝加哥的選擇權交易員與市場造市者在上週五迅速逢低買進基準指數低於 7,500 點的部位，但當指數漲破該水準時，賣出反彈部位的速度也一樣快。
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...