抄録
Production network refers to a line of economic activities in which firms buy intermediate goods from "upstream" firms, put added-values on them, and sell the goods to "downstream" firms or consumers in the end of the line. The entire line of these processes of putting added-values in turn forms a giant network of production ranging from upstream to downstream, down to consumers. Each process of production also requires labor and financing as inputs. Thus, production, labor and finance are the three corner stones for all economic activities. Net sum of added values in production network is basically the net total production, that is, GDP. While production network, its structure and temporal change are crucial in understanding macro-economic dynamics, little has been hitherto studied about them. In this talk, we report on uncovered large-scale features of production network comprising of a million firms (nodes) and millions of transactions (links) among them in Japan. We also talk about applications, epsecially to the problem of chain of bankruptcies, that would be potentially derived from the network informatics of real-data.
