Reports
Discussion Papers
No.1004 Where is the chokepoint? Mapping supply chain vulnerabilities using firm-to-firm transaction data
by Satoshi Inomata, Toru Hisamitsu, Fumihiko Imamura, Yuichi Kichikawa, Yoshiyuki Sagara
March 2026
ABSTRACT
This study proposes a novel approach to quantifying supply chain exposure to global risks with a particular focus on firms’ activities. The principal contribution of the study is that the proposed metric is specifically designed to address economic security issues, in which supply chain vulnerability is analyzed with respect to the level of network dependence on critical inputs and/or dominant foreign markets.
Keywords: global supply chain, choke point, vulnerability, economic security
JEL classification: C55, C67, F60
PDF available at http://hdl.handle.net/2344/0002001827
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.