最后一个因素是观念的产生，后者是学校对他们具有博士学位的教师数量和教师研究生产力为基础。

The final factor is idea generation which rates schools based on their number of faculty with doctorates and on faculty research productivity.

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“幸亏我们的尝试一直都没有成功，”谈及没有几个抵押贷款的临时修改保留下来时，研究生产力问题的专家乔根森（Jorgenson）如是说道。

“Fortunately we’ve been pretty unsuccessful, ” says Mr Jorgenson, a productivity expert at Harvard University, noting the small number of temporary mortgage modifications that have become permanent.

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