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• W4300558251 abstract "We propose an interacting particle system to model the evolution of a system of banks with mutual exposures. In this model, a bank defaults when its normalized asset value hits a lower threshold, and its default causes instantaneous losses to other banks, possibly triggering a cascade of defaults. The strength of this interaction is determined by the level of the so-called non-core exposure. We show that, when the size of the system becomes large, the cumulative loss process of a bank resulting from the defaults of other banks exhibits discontinuities. These discontinuities are naturally interpreted as systemic events, and we characterize them explicitly in terms of the level of non-core exposure and the fraction of banks that are about to default. The main mathematical challenges of our work stem from the very singular nature of the interaction between the particles, which is inherited by the limiting system. A similar particle system is analyzed in [DIRT15a] and [DIRT15b], and we build on and extend their results. In particular, we characterize the large-population limit of the system and analyze the jump times, the regularity between jumps, and the local uniqueness of the limiting process." @default.
• W4300558251 created "2022-10-03" @default.
• W4300558251 creator A5009434022 @default.
• W4300558251 creator A5039610130 @default.
• W4300558251 date "2017-05-01" @default.
• W4300558251 modified "2023-09-23" @default.
• W4300558251 title "Particle systems with singular interaction through hitting times: application in systemic risk modeling" @default.
• W4300558251 doi "https://doi.org/10.48550/arxiv.1705.00691" @default.
• W4300558251 hasPublicationYear "2017" @default.
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