If the stock went up yesterday, it's more likely to go up today, than if it didn't go up yesterday.

如果股票昨天涨了，今天涨的可能性也就更大，如果昨天没涨今天也不大可能会涨。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, there's been a number of articles that documented that stock prices tend to jump shortly after options are issued to managers.

有一些文章记载表明,在公司发给经理们股票期权之后,股票的价格往往会出现短期激涨

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since all the information is in the current price, you don't have to worry about whether it went up or down yesterday, to decide what it's going to do today.

因为当前价格代表了所有信息，你就不需要去考虑昨天股价,是涨了还是跌了，再去判断它今天的价格会怎么变化。

麻省理工公开课 - 计算机科学及编程导论课程节选