Agglomeration, Diffusion And Urban System

In recent years, China’s regional development gap presents a new trend. From1978to2004the economic development gap between the four zones continues to expand, since2004the economic development gap between the four zones is shrinking each year. Meanwhile, the role of urban agglomeration have become increasingly prominent in regional development, GDP of the top ten urban agglomerations in the share of china’s total GDP continued to rise, their economic growth rate is higher than the rest regions. Economic activities began to spread from the central cities to other cities around for the urban agglomerations at the advanced developing stage, while for the urban agglomerations at the early developing stage, economic activities is centered to big city. This paper studies under what conditions economic activities tends to cluster, and under what conditions economic activitiestends to diffusion; during development in urban agglomerations exhibit agglomeration and diffusion phenomena coexist, this paper tend to using the mathematical model to gives a logically consistent explanation the evolution of the urban system.Based on the new economic geography model and the empirical study, this paper give a reasonable explanation for the evolution trend of China’s regional differences. The first chapter is the introduction of this paper points out the necessity and feasibility studies; Chapter Ⅱ is a literature review; Chapter Ⅲ analyzes the evolutionary trends and the development trend of China’s urban agglomerations regional disparities; Chapter Ⅳ includes the establishment of a crowded city cost of new economic geography model to analyze the nonlinear effects of the regional integration process of regional disparities, as well as research to reduce the impact of urban congestion cost measures for regional development; Chapter Ⅴ to create a three-region model, to analyze the location, size of the market, impact on the comparative advantages of urban development; Chapter Ⅵ using the data of the prefecture-level city level to investigate the spatial autocorrelation of the cities and analyzes the impact of regional advantages of urban efficiency; Chapter Ⅶ is the conclusionThe main conclusions are as follows:Conclusion1:Trade costs between regions is an important factor affecting the spatial distribution of economic activity. With the promotion of regional integration, regional development gap will shrink after the first expansion of the process. With the decline of the cost of inter-regional trade, The regional development gap will expand, we must take certain regional policy to avoid the effects caused by excessive regional disparities.Conclusion2:When the cost of inter-regional trade in the middle level, industry concentration in the core area entirely, medium and small cities within cities rely on infrastructure is almost impossible to attract industry; only local regional trade costs are low enough, the improvement of the local infrastructure in order to attract industrial transfer from the core to the edge of the area district. On the other hand, cities housing policies to improve traffic conditions will lead to a further influx of population and industry..Conclusion3:geographical location plays an important role in urban development, geographic non-neutral. When economic activity began to spread out from the core cities, industries will be the first small cities to large cities around the transfer, the formation of urban agglomerations or metropolitan area. For the geographic conditions of poor areas, even though it has the advantages of natural resources may not be able to attract industry. Only when the cost of inter-regional trade is less than a critical value, the resource endowment prone areas can significantly promote regional development.Conclusion4:Use of prefecture-level city data econometric analysis found that the evolution of China’s urban population is still at the core-periphery mode phase, the core of the city and surrounding contact between small cities dominate the urban linkages among urban cluster. Not form a group of small cities within cities between rational division of labor, there is no effective urban network of contacts.