摘要
基于以连续、线性空间为特征的NEG城市体系模型,探讨对称双城市的城乡结构下,随着交易成本的变化,城乡空间经济受到人口总量变化的影响。研究认为,扩大人口总量会同时增加城乡人口,但城市人口增速更快,从而城市化水平随着人口规模的扩大而上升。通常情况下,随着人口规模的扩大,交易成本越高则城市人口和城市化水平的增加速度越快,而农村人口则正好相反。在交易成本较高时,城乡居民的实际福利水平随着人口的增加而降低,交易成本越高则降低得越快;而当交易成本较低时,随着人口的增加,城乡居民的实际福利水平先提升后降低,此时存在最优的总人口和城市人口规模,最优规模随着交易成本的降低而扩大。随着交易成本的降低,人口的属性由“负担”转变为“资源”,这为城市的人口政策提供了理论支撑。交易成本的持续降低不仅是城市化的重要推动力,还将极大地改变我国的城市体系空间结构。
The aothor develops a NEG urban system model characterized by continuous and linear space to explore the impact of the total population change on the urban and rural spatial economy with the change of transaction costs under the urban-rural structure of symmetric twin cities. According to the research, expanding the total population will increase the urban and rural population at the same time, but the urban population grows faster, so the urbanization level will increase with the expansion of population size. Generally, with the expansion of population, the higher the transaction cost, the faster the increase of urban population and urbanization level, while the rural population is on the contrary. When the transaction cost is high, the actual welfare level of urban and rural residents decreases with the increase of population, and the higher the transaction cost is, the faster the decrease is. When the transaction cost is low, the actual welfare level of urban and rural residents increases first and then decreases with the increase of population. At this time, there exists an optimal total population and urban population scale, and the optimal scale expands with the decrease of transaction cost. With the reduction of transaction costs, the attribute of population changes from "burden" to "resource", which provides theoretical support for urban population policies. The continuous reduction of transaction cost is not only an important driving force of urbanization, but also will greatly change the spatial structure of China’s urban system.
作者
何文
He Wen(Business School,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《河北经贸大学学报》
CSSCI
北大核心
2022年第5期57-63,共7页
Journal of Hebei University of Economics and Business
