Contagious McKean–Vlasov systems with heterogeneous impact and exposure

Zachary Feinstein () and Andreas Søjmark ()
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Zachary Feinstein: Stevens Institute of Technology
Andreas Søjmark: London School of Economics

Finance and Stochastics, 2023, vol. 27, issue 3, No 3, 663-711

Abstract: Abstract We introduce a particular heterogeneous formulation of a class of contagious McKean–Vlasov systems, whose inherent heterogeneity comes from asymmetric interactions with a natural and highly tractable structure. It is shown that this formulation characterises the limit points of a finite particle system, deriving from a balance-sheet-based model of solvency contagion in interbank markets, where banks have heterogeneous exposure to and impact on the distress within the system. We also provide a simple result on global uniqueness for the full problem with common noise under a smallness condition on the strength of interactions, and we show that in the problem without common noise, there is a unique differentiable solution up to an explosion time. Finally, we discuss an intuitive and consistent way of specifying how the system should jump to resolve an instability when the contagious pressures become too large. This is known to happen even in the homogeneous version of the problem, where jumps are specified by a ‘physical’ notion of solution, but no such notion currently exists for a heterogeneous formulation of the system.

Keywords: Mean-field limit; Contagion; Heterogeneous network; Default cascades; Dynamic interbank model; Systemic risk; 60K35; 60H10; 60F17; 91G80 (search for similar items in EconPapers)
JEL-codes: G01 G21 G32 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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DOI: 10.1007/s00780-023-00504-2

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