Investor sentiment and option prices

• 成果类型: Article; Proceedings Paper
• 署名作者: Han, Bing
• 署名单位: University of Texas System; University of Texas Austin
• 刊物名称: REVIEW OF FINANCIAL STUDIES
• ISSN/ISSBN: 0893-9454
• DOI: 10.1093/rfs/hhm071
• 发表日期: 2008
• 页码: 387
• 关键词: volatility; implicit; arbitrage; earnings; MARKETS; MODEL

摘要

This paper examines whether investor sentiment about the stock market affects prices of the S&P 500 options. The findings reveal that the index option volatility smile is steeper (flatter) and the risk-neutral skewness of monthly index return is more (less) negative when market sentiment becomes more bearish (bullish). These significant relations are robust and become stronger when there are more impediments to arbitrage in index options. They cannot be explained by rational perfect-market-based option pricing models. Changes in investor sentiment help explain time variation in the slope of index option smile and risk-neutral skewness beyond factors suggested by the current models.