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首页> 外文期刊>International journal of theoretical and applied finance >EXTREMAL DEPENDENCE FOR BILATERAL CREDIT VALUATION ADJUSTMENTS
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EXTREMAL DEPENDENCE FOR BILATERAL CREDIT VALUATION ADJUSTMENTS

机译:双向信用评估调整的极端依赖

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摘要

Recognizing counterparty default risk as integral part of the valuation process of financial derivatives has changed the classical view on option pricing. Calculating the bilateral credit valuation adjustment (BCVA) including wrong way risk (WWR) requires a sound model for the dependence structure between three quantities: the default times of the two contractual parties and the derivative/portfolio value at the first of the two default times. There exist various proposals, but no market consensus, on how this dependence structure should be modeled. Moreover, available mathematical tools depend strongly on the marginal models for the default times and the model for the underlying of the derivative. In practice, independence between all (or some) quantities is still a popular (over-)simplification, which completely misses the root of WWR. In any case, specifying the dependence structure imposes one to model risk and even within some parametric model one typically obtains a considerable interval of BCVA values when the parameters are taken to the extremes. In this work, we present a model-free approach to identify the dependence structure that implies the extremes of BCVA. This is achieved by solving a mass-transportation problem using tools from optimization.
机译:认识到交易对手违约风险是金融衍生品估值过程中不可或缺的一部分,这改变了期权定价的传统观点。计算包括错误方法风险(WWR)在内的双边信用评估调整(BCVA),需要一个可靠的模型来建立三个数量之间的依存关系结构:两个合同方的默认时间以及两个默认时间中的第一时间的衍生产品/投资组合价值。关于如何建立这种依存关系模型,存在各种建议,但没有市场共识。此外,可用的数学工具在很大程度上取决于默认时间的边际模型和衍生工具基础的模型。实际上,所有(或某些)数量之间的独立性仍然是普遍的(过度)简化,这完全错过了WWR的根源。在任何情况下,指定依赖关系结构都需要对风险进行建模,即使在某些参数模型内,当参数达到极限时,通常也可以获得相当大的BCVA值间隔。在这项工作中,我们提出了一种无模型的方法来识别依赖结构,该依赖结构暗示了BCVA的极端情况。这是通过使用优化工具解决大规模运输问题而实现的。

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