Document Type

Article

Publication Date

10-10-2026

Abstract

We study how background risk affects optimal liability rules in a unilateral accident model with risk-averse parties. Under negligence, background risk borne by a prudent victim raises the optimal due-care standard relative to the benchmark case without background risk. Under strict liability, the optimal level of damages is higher when the prudent victim faces background risk but the injurer does not. When a prudent injurer faces background risk (with or without victim background risk), the optimal level of damages can be higher or lower than in the benchmark case. Our results are robust to the availability of actuarially fair insurance.

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