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| Mohit Arora and Deepankar Basu |
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| ''Singularity of input-output matrices: Structural linkages and spectral properties'' |
| ( 2026, Vol. 0 No.0 ) |
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| Analyzing 5 historical and 670 contemporary input-output (IO) tables, we show that all of these IO matrices are singular. We map this phenomenon onto underlying production network topologies. While singularity trivially emerges from sectors lacking intermediate forward or backward linkages, it could frequently persist due to deeper economic properties: proportional cost structures across sectors, isolated economic sub-networks, and supply-chain hierarchies lacking intra-industry transactions. As a subset of these matrices is non-diagonalizable, we leverage this singularity to derive simple, rank and eigenvalue based diagnostic criteria for diagonalizability. This provides an efficient computational test for network shock propagation models using eigendecomposition. |
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| Keywords: input-output matrices, singularity, diagonalizability, production networks |
JEL: C6 - Mathematical Methods and Programming: General
D5 - General Equilibrium and Disequilibrium: General |
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| Manuscript Received : Apr 21 2026 | | Manuscript Accepted : Oct 10 2026 |
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