Causal Hierarchy in the Financial Market Network—Uncovered by the Helmholtz–Hodge–Kodaira Decomposition
Year: 2024
Type: article
Abstract: Granger causality can uncover the cause-and-effect relationships in financial networks. However, such networks can be convoluted and difficult to interpret, but the Helmholtz–Hodge–Kodaira decomposition can split them into rotational and gradient components which reveal the hierarchy of the Granger causality flow. Using Kenneth French’s business sector return time series, it is revealed that during the COVID crisis, precious metals and pharmaceutical products were causal drivers of the financial network. Moreover, the estimated Granger causality network shows a high connectivity during the crisis, which means that the research presented here can be especially useful for understanding crises in the market better by revealing the dominant drivers of crisis dynamics.
DOI: 10.17879/73998599339
Authors: Wand, Tobias, Kamps, Oliver, Iyetomi, Hiroshi
Language: English
Subfield: Economics and Econometrics
Domain: Social Sciences
Open Access status: green
Award: G4773003264
OpenAlex ID: W6887923232
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