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The professors also analyzed the rate at which different types of assets had their ratings downgraded or upgraded and found a similar pattern.

几位教授还分析了不同种类资产的评级升降几率，发现了类似的规律。

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Off the court and in the classroom, Obama found peers and professors who challenged him to think more deeply.

在球场和教室以外，奥巴马发现同龄人和教授使他思考得更加深刻了。

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Any change in the rate of searches for jobs correlates with up and down movements in the unemployment rate, the professors found.

FORBES: Using Google to Predict the Unemployment Rate

The professors found that investors can beat the market by about two percentage points a year, after trading costs, but only by piggybacking on the shares of every company that engages in this practice.

WSJ: How to Prey on Executive Pay

The professors also found that the CEOs, besides being optimistic about life in general, were upbeat about the prospects of their businesses and were more willing to take risks than members of the general population.

FORBES: Optimists Become CEOs, Study Finds