偏度、基差风险和最优期货需求

Massimiliano Barbi, S. Romagnoli
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引用次数: 7

摘要

为了考虑偏态对最优期货需求的影响,本文提出了现金收益和期货收益服从双变量偏态分布的期货最大期望效用对冲模型。相对于二元正态性的基准,当代理具有显著的风险厌恶时,偏度具有实质性影响。纯对冲需求大于或小于最小方差需求,取决于现金和期货头寸的相对偏度。纯套期保值和最小方差需求之间的差异随着基差风险的增加而增加,即现金和期货收益之间的不完全相关性。当代理人适度而非无限规避风险时,存在投机头寸的空间,最优期货需求受期货市场基差风险和预期收益的双重驱动。
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Skewness, Basis Risk, and Optimal Futures Demand
We propose a maximum-expected utility hedging model with futures where cash and futures returns follow a bivariate skew-normal distribution, such to consider the effect of skewness on the optimal futures demand. Relative to the benchmark of bivariate normality, skewness has a material impact when the agent is significantly risk averse. Pure hedging demand is either greater or smaller than minimum-variance demand, depending on the relative skewness of cash and futures positions. The difference between pure hedging and minimum-variance demand increases with basis risk, i.e. the imperfect correlation between cash and futures returns. When the agent is moderately but not infinitely risk averse, there is room for speculative positions, and the optimal futures demand is driven by both basis risk and the expected return on the futures market.
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