北京市产业网络节点交易地位演变分析

Transaction status evolution of sector nodes in industrial network of Beijing

城市经济增长、产业结构演变等宏观发展趋势下蕴含着产业部门之间的市场关系转换,各种产业的经济活动在复杂的供需关系制约架构形成类似于网络的结构。利用北京市2002年、2007年投入产出表基本流量数据表,构建产业交易链接网络,利用网络分析方法分析了产业网络基本特征的演变,并讨论了产业网络节点交易地位演变,发现:(1)5 a间产业交易对增加,产业间交易更为频繁,网络交易密度增大,网络平均最短路径降低,交易可达性增强。(2)产业节点市场交易规模方面,交易中心稳定但地位变动趋异,且供给-需求中心的角色结构有所变化。(3)产业交易市场数及其分布变动明显,且第三产业的交易市场数、增幅高于第二产业,呈现出产业结构升级的趋势。(4)产业网络的供给-需求交易强度、产业间差异扩大,首位交易对象稳定,自环交易特征强化。(5)产业网络中二、三产业市场灵敏度位序升降趋异,生产性服务业灵敏度中心稳定。

The tendency of city economic growth and the development of industrial structure contains the process of market relationship conversion and the value flow shift between sectors of national economy. Each sector requires others＇ outputs as production factors, meanwhile provides its outputs to other sectors as consumption. And then there exists interdependency and interaction of demand-supply relationship between sectors. This kind of complex relationship structure is similar to certain industrial network. Network analysis of the industrial structure is an impor- tant aspect in study area. The present studies focused primarily on two aspects： the determination of the network to- pology indicators. These analyses have a common characteristic ： the vast majority of them are tending to explain in- dustrial network as topology network. But they missed the point that the discussion of network nodes and rims＇ actu- al significance. In this regard, there are three aspects worth to be analyzed. First, it is not meaningful to measure the connectivity of industrial network by average shortest path. Second, undirected treatment and unweighted treatment can＇ t reveal the true face of the industry network. Third, most of the studies did not carry out the discussion on self-loop. As an open and dynamic system, inter-industry relation in industrial network affects the development state of various industries, and in turn drives the evolution of industry network. For this reason, it is very necessary to find out the topology characteristics of industry network and figure out the evolution process of industry network. On the basis of the analysis of strengthen the weight of rim and node, in consideration of the random walk centrality, this paper attempts to answer two specific questions. First, what changes have occurred on industries＇ position in net- work structure？ Second, whether the network centralities rank of industries change significantly？ If there are any change, dose this change reflects the direction of Beijing industrial restructuring？On the basis of the input-output ta- bles of Beijing in 2002 and 2007, this paper constructs the industrial network of Beijing, and analyzes the evolution of the network features, then discusses the changing transaction status of sector nodes from 2002 to 2007. The re- sults are as follows ： （ 1 ） During the 5 years, following the network＇ s tions have become more aggressive to promote the network and the the changes of trading centers＇ status are different in 2002 and trading pairs of sectors increasing, the transac- network accessibility. （2）for transaction scale, 2007, and the network structure roles of de- mand-supply center are also different. （3） there is a obvious change in the distribution of number of the trading mar- kets, and the increasing rate of trading market number of tertiary industry is higher than secondary industry. It shows the trends of upgrading in industrial structure. （4）the strength of transaction linkage and the differences of sector trading have been expanded. However, the object of first trading sector is relatively stable, and the feature of self-loop trading is prominent. （5）the change in rank of sensitivity of tertiary industry and secondary industry is dif- ferent, but the random walk centrality of producer services industry is steady.