3Krugman P. Increasing Returns and EconomicGeography[J].Joumal of Political Economy, 1991 (99).
4Krugman P. On the Relationship Between Trade Theory and Location Theory [J]. Review of International Economics, 1993(1).
5Krugman P. First Nature,Seeond Nature and Metropolitan Location[J]. Journal of Regional Scienee, 1993,33(2).
6Marshall A.Principles of economics [M].Beijing:China Social Scienes Pub.House, 1999.
7Krugman P. ,Space:The Final Frontier [J].The Journal of E- conomic Perspectives, 1998,12 (2).
8North D.C.Institution and Economic Development[J].Taiwan Economic keview, 1995 (23).
9Puga D.and Venables A.J.The Spread of Industry:Spatial Agglomeration in EconOmic development [J].Joumal of the Japanese and International Economies,1996(10).