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Ruin probability in the Cramér-Lundberg model with risky investments

机译:具有风险投资的Cramér-Lundberg模型的破产概率

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摘要

We consider the Cramér-Lundberg model with investments in an asset with large volatility, where the premium rate is a bounded nonnegative random function ct and the price of the invested risk asset follows a geometric Brownian motion with drift a and volatility σ > 0. It is proved by Pergamenshchikov and Zeitouny that the probability of ruin, ψ(u), is equal to 1, for any initial endowment u ≥ 0, if ρ: = 2a/σ~2 ≤ 1 and the distribution of claim size has an unbounded support. In this paper, we prove that ψ(u) = 1 if ρ ≤ 1 without any assumption on the positive claim size.
机译:我们考虑对具有较大波动性的资产进行投资的Cramér-Lundberg模型,其中溢价率是有界非负随机函数ct,投资风险资产的价格遵循几何布朗运动,其漂移为a,波动率σ> 0。 Pergamenshchikov和Zeitouny证明,对于任何初始end u≥0,如果ρ:= 2a /σ〜2≤1且索赔额的分布无界,则破产概率ψ(u)等于1。支持。在本文中,我们证明如果ρ≤1,则ψ(u)= 1,而无需对正索赔大小进行任何假设。

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