虚值看涨期权、波动率微笑与 BSM-CAPM 一致性
文章 arXiv papers · 作者: Jarno Talponen
总结
这篇短文考察一种持有短期限、价外欧式看涨期权的简单策略。文中认为,该策略在 Black-Scholes-Merton 框架下显得异常有吸引力,因此引出了该模型与资本资产定价模型之间可能存在的不一致。文章借此探讨期权定价假设与投资回报之间的关系。
文中提出的解决方案着眼于结构:要使这些模型保持一致,就需要调整定价规则,具体体现为改变状态价格密度。短文指出,这种调整必然会产生某种形式的波动率微笑。这里呈现的是理论推论,而非基于所报告的实证测试。现有描述没有提供交易构建细节、收益估计、校准流程或市场数据,因此不能证明买入这些看涨期权在实践中能够盈利。其主要启示在于定价框架之间的一致性,以及这对不同执行价隐含波动率的影响。
核心观点
- 短文考察一种持有短期限、价外欧式看涨期权的策略。
- 该策略在 Black-Scholes-Merton 框架下显得异常有利可图。
- 这一推论被认为可能与资本资产定价模型不一致。
- 要实现一致定价,需要调整状态价格密度。
- 短文认为这类调整意味着波动率微笑,但没有给出实证交易结果。
标签
全文
# On volatility smile and an investment strategy with out-of-the-money calls # On volatility smile and an investment strategy with out-of-the-money calls A motivating question in this paper is whether a sensible investment strategy may systematically contain long positions in out-of-the-money European calls with short expiry. Here we consider a very simple trading strategy for calls. The main points of this note are the following. First, the presented trading strategy appears very lucrative in the Black-Scholes-Merton (BSM) framework. In fact, it is such even to the extent that the BSM model turns out to be, in a sense, incompatible with the CAPM. Second, if one wishes to adapt these models together, then the adjustment of the consistent pricing rule (i.e. modifying state price densities) inevitably leads to some form of volatility smile and this is the main point of the paper. Moreover, these observations arise from purely structural considerations.
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