现在在伊利诺伊州西北大学的研究者们，当时由德尔克·布洛克曼带头，对超过五十万张一美元钞票在五年内的活动情况进行了分析。

Researchers led by Dirk Brockmann, now at Northwestern University in Illinois, analysed the movements of more than half a million US one-dollar bills as they were passed around over five years.

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“此次地震对我们是一次教训，”艾米尔欧卡尔说，他是伊利诺伊州伊万斯顿西北大学的一名地球物理学家，她的研究领域是巨大地震和巨大海啸。

"This earthquake is a lesson in humility," says Emile Okal, a geophysicist at Northwestern University in Evanston, Illinois, who studies great earthquakes and tsunamis.

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根据伊利诺伊州西北大学金融学教授，该篇论文作者之一，Paola Sapienza所说，这正是曾经所发生的一切的根源。

According to Paola Sapienza, a professor of finance at Northwestern University in Illinois who is one of the paper's authors, that is just what has happened.

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