full paper is here. The two shoulders come from urban and rural population


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送交者: Amsel 于 2010-02-06, 18:36:36:

回答: 这么读对么? 由 梅子 于 2010-02-06, 18:16:15:

respectively.
http://www.columbia.edu/~xs23/papers/pdfs/Pinkovskiy_Salaimartin_WDI_NBER.pdf



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