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arXiv 1906.09347math.PR
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二维布朗模型中分量破产概率的对数渐近性

Logarithmic asymptotics for probability of component-wise ruin in a two-dimensional Brownian model

Krzysztof Debicki, Lanpeng Ji, Tomasz Rolski

摘要:

考虑了一类二维破产问题,其中业务线的盈余过程由二维相关的带漂移的布朗运动模型描述。研究了两条业务线在无限时间内破产的情形下的破产函数$P(u)$,其中$u$是两条业务线的初始资本相同.我们通过分析调整系数来衡量企业的优度,即当$u$趋于无穷大时,$-\ln P(u)/u$的极限,它本质上取决于两个盈余过程的相关性$ρ$。为了计算调整系数,我们解决了一个两层最优化问题。

英文摘要:

We consider a two-dimensional ruin problem where the surplus process of business lines is modelled by a two-dimensional correlated Brownian motion with drift. We study the ruin function $P(u)$ for the component-wise ruin (that is both business lines are ruined in an infinite-time horizon), where $u$ is the same initial capital for each line. We measure the goodness of the business by analysing the adjustment coefficient, that is the limit of $-\ln P(u)/u$ as $u$ tends to infinity, which depends essentially on the correlation $ρ$ of the two surplus processes. In order to work out the adjustment coefficient we solve a two-layer optimization problem.

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