Discussion Papers


by Satoshi Inomata and Tesshu Hanaka

October 2021


In this paper we present and analyze new referential statistics for risk assessment on geographical concentration of global supply chains. The study’s net contribution rests on the development of a metric which indicates geographical concentration in terms of the frequency of supply chain engagement with the regions of analytical concerns, alongside the traditional approach based on volume measures of value-added concentration.

Japan, a country with a high propensity to encounter natural hazards, and China, under a mounting geopolitical tension with the United States, are chosen as target regions for the risk assessment. The analysis follows a line of techniques in input-output economics known as the "key sector analysis", yet with methodological augmentation by a compatible analytical framework in the network theory. Using the latest set of multi-country input-output tables constructed by the Organisation for Economic Co-operation and Development (OECD), the concentration risks of some key global supply chains such as the automotive industry and the ICT/electronics equipment industry are identified.

Keywords: risk assessment, global supply chains, choke points, input-output analysis

JEL classification: C67, F52, F60

Please note that discussion papers are works in various stages of progress and most have not been edited and proofread and may contain errors of fact or judgment. Revised versions of these papers may subsequently appear in more formal publication series. The views expressed in this publication are those of the author(s). The IDE does not guarantee the accuracy of the data included and accepts no responsibility for any consequences arising from its use.