当前，美股极易出现剧烈波动，主要原因在于流动性不足，以及受头条新闻驱动的算法交易机器人的影响。

　　一条关于特朗普关税计划的虚假推文，在周一促使市场反弹，市值增加2.7万亿美元，并且在当日再次推动美股上涨。

　　做市商开始退缩，交易员难以跟上市场节奏，这不仅导致交易成本上升，也使得美股的波动性急剧增加。这种情况目前依然存在，在最近一个交易日开始时，标普500指数飙升超过4%。

　　期权数据提供商Spot Gamma的创始人布伦特・科丘巴（Brent Kochuba）表示：“市场流动性很差，因此一个规模较大的订单就能对市场造成影响。”

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