悬赏 40 个论坛币 未解决
第一篇:Glaeser, Edward and D. Cutler, 1997, Are Ghettos Good or Bad?, Quarterly Journal of Economics 112, 827-872. 
第二篇:Glaeser, Edward and G. Ellison, 1999, The Determinants of Geographic Concentration, American Economic Review Papers and Proceedings 89(2), 311-316.
每篇20币,谢谢啦!!!急需!