Parisian excursion with capital injection for draw-down reflected Levy insurance risk process

TL;DR

This paper analyzes a Parisian ruin problem with capital injections in Levy insurance risk processes, deriving explicit formulas for ruin probabilities, joint distributions, and expected capital injections using advanced fluctuation theory.

Contribution

It introduces a novel Parisian ruin framework with capital injections at draw-down times, providing semi-explicit formulas based on spectrally negative Levy process theory.

Findings

Derived explicit Parisian ruin probability formulas

Obtained joint Laplace transforms of ruin-related variables

Provided numerical analysis of initial surplus and observation frequency effects

Abstract

This paper discusses Parisian ruin problem with capital injection for Levy insurance risk process. Capital injection takes place at the draw-down time of the surplus process when it drops below a pre-specified function of its last record maximum. The capital is continuously paid to keep the surplus above the draw-down level until either the surplus process goes above the record high or a Parisian type ruin occurs, which is announced at the first instance the surplus process has undergone an excursion below the record for an independent exponential period of time consecutively since the time the capital was first injected. Some distributional identities concerning the excursion are presented. Firstly, we give the Parisian ruin probability and the joint Laplace transform (possibly killed at the first passage time above a fixed level of the surplus process) of the ruin time, surplus position at ruin, and the total capital injection at ruin. Secondly, we obtain the $q$-potential measure of the surplus process killed at Parisian ruin. Finally, we give expected present value of the total discounted capital payments up to the Parisian ruin time. The results are derived using recent developments in fluctuation and excursion theory of spectrally negative Levy process and are presented semi explicitly in terms of the scale function of the Levy process. Some numerical examples are given to facilitate the analysis of the impact of initial surplus and frequency of observation period to the ruin probability and to the expected total capital injection.