Optimal Underreporting and Competitive Equilibrium
Mathematical Finance
2026-01-21 v1
Abstract
This paper develops a dynamic insurance market model comprising two competing insurance companies and a continuum of insureds, and examines the interaction between strategic underreporting by the insureds and competitive pricing between the insurance companies under a Bonus-Malus System (BMS) framework. For the first time in an oligopolistic setting, we establish the existence and uniqueness of the insureds' optimal reporting barrier, as well as its continuous dependence on the BMS premiums. For the 2-class BMS case, we prove the existence of Nash equilibrium premium strategies and conduct an extensive sensitivity analysis on the impact of the model parameters on the equilibrium premiums.
Cite
@article{arxiv.2601.12655,
title = {Optimal Underreporting and Competitive Equilibrium},
author = {Zongxia Liang and Jiayu Zhang and Zhou Zhou and Bin Zou},
journal= {arXiv preprint arXiv:2601.12655},
year = {2026}
}