文章基本信息

标题：A Simple Model to Explain Expensive Index Call Options
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作者：Sang Baum Kang
期刊名称：Theoretical Economics Letters
印刷版ISSN：2162-2078
电子版ISSN：2162-2086
出版年度：2017
卷号：07
期号：03
页码：316-323
DOI：10.4236/tel.2017.73024
语种：English
出版社：Scientific Research Publishing
摘要：According to the empirical finance literature, S&P 500 Index call options frequently violate the stochastic dominance upper bounds. In other words, index call options in the US are frequently overpriced. I propose a theoretical model to explain the reason for this. A simple economic model in this article reveals that when agents are sufficiently heterogeneous, a call option may be overpriced from the perspective of the representative agent. The key economic intuitions can be summarized as follows: First, if agents are sufficiently heterogeneous, a bullish agent, who is hungry for the “exposure” to a stock, may buy an expensive call option from a constrained bearish agent. Second, even though a call option is fairly priced from the perspectives of heterogeneous market participants, it may be overpriced from the perspective of the representative agent. Assuming reasonable parameters of heterogeneity, I find that a call option price violates the representative agent’s stochastic dominance upper bound.
关键词：Heterogeneity in Beliefs;Stochastic Dominance Upper Bound;Index Option;Call Option;Representative Agent