请问这篇论文的名称是什么？

这是Arkolakis 的一篇讲义中出现的。
参考文献有：Allen, T., and C. Arkolakis (2014): “Trade and the topography of the spatial economy,”Quarterly Journal of Economics.

Allen, T., C. Arkolakis, and Y. Takahashi (2014): “Universal gravity,” NBER Working Paper, (w20787).
Cronon, W. (1992): Nature’s metropolis: Chicago and the Great West. WW Norton &Company.

Lucas, R. E., and E. Rossi-Hansberg (2003): “On the Internal Structure of Cities,”Econometrica, 70(4), 1445–1476

您理解的话麻烦作答一下，不胜感激！

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