周一美股早盘走高，创下本月最大跌幅的标准普尔500指数开始反弹，投资者对哈里伯顿等公司财报情绪乐观。

U.S. stocks climbed, with the Standard &Poor’s 500 Index rebounding from the biggest selloff this month amid optimism about earnings from companies such as Halliburton Co.

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根据波动率指数，投资者乐观情绪在4月28号到达顶峰，早于股市顶峰5天。

According to the VIX, investor optimism reached its apogee on April 28, five days prior to the day of the top.

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