最新报道:According to Bijie.com, Citadel Securities warned investors not to ignore seasonal stock market fluctuations. Scott Rubner, head of equity and derivatives strategy at the firm, noted that this week was the weakest for the S&P 500, based on data going back to 1990, and was prone to single-day declines of 1%. Although the S&P 500 has risen about 3% so far in September, the average decline in September over the past five years has been 4.2%.