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首页> 外文期刊>Journal of Economic Dynamics and Control >Optimal portfolios when variances and covariances can jump
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Optimal portfolios when variances and covariances can jump

机译:方差和协方差可以跳跃时的最优投资组合

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We analyze the optimal portfolio choice in a multi-asset Wishart-model in which return variances and correlations are stochastic and subject to jump risk. The optimal portfolio is characterized by the positions in stock diffusion risk, variance-covariance diffusion risk, and jump risk. We find that including jumps in the second moments changes the optimal positions and particularly variance-covariance hedging demands significantly. Erroneously omitting these jumps gives rise to substantial model risk. Furthermore, variance-covariance jump risk can have a significant impact on potential utility gains when the market is completed by adding derivatives. As a robustness check, we compare our results to those obtained for other parametrizations of Wishart-models from the literature as well as to various single-asset models. (C) 2017 Elsevier B.V. All rights reserved.
机译:我们分析了多资产Wishart模型中的最优投资组合选择,该模型中的收益方差和相关性是随机的,并且存在跳跃风险。最优投资组合的特征在于股票扩散风险,方差-协方差扩散风险和跳跃风险的头寸。我们发现,包括第二时刻的跳跃会极大地改变最佳位置,尤其是方差-协方差套期保值需求。错误地忽略这些跳跃会导致大量模型风险。此外,当通过添加衍生工具完成市场时,方差-协方差跳跃风险可能会对潜在的效用收益产生重大影响。作为鲁棒性检查,我们将我们的结果与从文献以及其他各种资产模型的Wishart模型的其他参数化获得的结果进行比较。 (C)2017 Elsevier B.V.保留所有权利。

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