ARBITRAGE, HEDGING AND UTILITY MAXIMIZATION USING SEMI-STATIC TRADING STRATEGIES WITH AMERICAN OPTIONS

• 成果类型: Article
• 署名作者: Bayraktar, Erhan; Zhou, Zhou
• 署名单位: University of Michigan System; University of Michigan; University of Minnesota System; University of Minnesota Twin Cities
• 刊物名称: ANNALS OF APPLIED PROBABILITY
• ISSN/ISSBN: 1050-5164
• DOI: 10.1214/16-AAP1184
• 发表日期: 2016
• 页码: 3531-3558
• 关键词: optimal investment

摘要

We consider a financial market where stocks are available for dynamic trading, and European and American options are available for static trading (semi-static trading strategies). We assume that the American options are infinitely divisible, and can only be bought but not sold. In the first part of the paper, we work within the framework without model ambiguity. We first get the fundamental theorem of asset pricing (FLAP). Using the FTAP, we get the dualities for the hedging prices of European and American options. Based on the hedging dualities, we also get the duality for the utility maximization. In the second part of the paper, we consider the market which admits nondominated model uncertainty. We first establish the hedging result, and then using the hedging duality we further get the FTAP. Due to the technical difficulty stemming from the nondominancy of the probability measure set, we use a discretization technique and apply the minimax theorem.