Large-scale structure of a nation-wide production network
Large-scale structure of a nation-wide production network
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DOI：
10.1140/epjb/e2010-00275-2
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发表时间：
2010-10-01
影响因子：
1.6
通讯作者：
Aoyama, H.
中科院分区：
文献类型：
--
作者：
Fujiwara, Y.;Aoyama, H.
在一个经济体中，生产是一系列企业作为供应商和客户的活动;一个企业从其他企业购买商品，增加价值，并在一个巨大的生产网络中向其他企业出售产品。尽管生产网络的结构对于理解经济动态的许多方面和建立模型很重要，但缺乏实证研究。我们研究了一个全国性的生产网络，包括一百万个公司和数百万个制造商-客户的联系，使用最新的统计方法在物理学。在实证分析中，我们展示了无标度度分布、离散性、度与企业规模的相关性以及具有部门和区域模块的社区结构。由于供应商通常向其客户提供信贷，而客户又反过来向供应商提供信贷，因此每一个环节实际上都是一种债权人-债务人关系。我们还研究了网络中沿着这些链接发生的失败或破产链，以及相应的雪崩大小分布。
Production in an economy is a set of firms' activities as suppliers and customers; a firm buys goods from other firms, puts value added and sells products to others in a giant network of production. Empirical study is lacking despite the fact that the structure of the production network is important to understand and make models for many aspects of dynamics in economy. We study a nation-wide production network comprising a million firms and millions of supplier-customer links by using recent statistical methods developed in physics. We show in the empirical analysis scale-free degree distribution, disassortativity, correlation of degree to firm-size, and community structure having sectoral and regional modules. Since suppliers usually provide credit to their customers, who supply it to theirs in turn, each link is actually a creditor-debtor relationship. We also study chains of failures or bankruptcies that take place along those links in the network, and corresponding avalanche-size distribution.