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ARBITRAGE-FREE BILATERAL COUNTERPARTY RISK VALUATION UNDER COLLATERALIZATION AND APPLICATION TO CREDIT DEFAULT SWAPS

机译:协作下无套利的双边交易对手风险评估及在信用违约掉期中的应用

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摘要

We develop an arbitrage-free valuation framework for bilateral counterparty risk, where collateral is included with possible rehypothecation. We show that the adjustment is given by the sum of two option payoff terms, where each term depends on the netted exposure, i.e., the difference between the on-default exposure and the predefault collateral account. We then specialize our analysis to credit default swaps (CDS) as underlying portfolios, and construct a numerical scheme to evaluate the adjustment under a doubly stochastic default framework. In particular, we show that for CDS contracts a perfect collateralization cannot be achieved, even under continuous collateralization, if the reference entity's and counterparty's default times are dependent. The impact of rehypothecation, collateral margining frequency, and default correlation-induced contagion is illustrated with numerical examples.
机译:我们针对双边交易对手风险开发了无套利的估值框架,其中包括抵押品和可能的重新抵押。我们表明,调整是通过两个期权支付期限的总和来进行的,其中每个期限取决于净风险敞口,即违约风险敞口和违约前抵押账户之间的差额。然后,我们将分析专门化为作为基础投资组合的信用违约掉期(CDS),并构建一个数值方案来评估在双重随机违约框架下的调整。特别是,我们表明对于CDS合同,即使参考实体和交易对手的默认时间是依赖的,即使在连续抵押下也无法实现完美的抵押。再数字化示例说明了再抵押,抵押品保证金频率和默认关联引发的传染的影响。

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