Graduate School of Simulation Studies, The University of Hyogo, Kobe, Japan.
Faculty of Science, Niigata University, Niigata, Japan.
PLoS One. 2018 Aug 29;13(8):e0202739. doi: 10.1371/journal.pone.0202739. eCollection 2018.
This paper studies the structure of the Japanese production network, which includes one million firms and five million supplier-customer links. This study finds that this network forms a tightly-knit structure with a core giant strongly connected component (GSCC) surrounded by IN and OUT components constituting two half-shells of the GSCC, which we call awalnut structure because of its shape. The hierarchical structure of the communities is studied by the Infomap method, and most of the irreducible communities are found to be at the second level. The composition of some of the major communities, including overexpressions regarding their industrial or regional nature, and the connections that exist between the communities are studied in detail. The findings obtained here cause us to question the validity and accuracy of using the conventional input-output analysis, which is expected to be useful when firms in the same sectors are highly connected to each other.
本文研究了日本生产网络的结构，其中包括一百万 家企业和五百万个供应商-客户链接。研究发现，该网络形成了一个紧密的结构，一个核心的巨型强连通组件（GSCC）被 IN 和 OUT 组件包围，构成了 GSCC 的两个半壳，我们称之为腰果结构，因为它的形状。通过 Infomap 方法研究了社区的层次结构，发现大多数不可约社区都处于第二级。详细研究了一些主要社区的组成部分，包括它们在工业或地区性质方面的过度表达，以及社区之间存在的联系。这里得到的发现使我们对使用传统的投入产出分析的有效性和准确性产生了质疑，预计当同一部门的企业之间高度相互连接时，这种分析将是有用的。
