《The Value of Timing Risk》
---
作者:
Jiro Akahori, Flavia Barsotti and Yuri Imamura
---
最新提交年份:
2017
---
英文摘要:
The aim of this paper is to provide a mathematical contribution on the semi-static hedge of timing risk associated to positions in American-style options under a multi-dimensional market model. Barrier options are considered in the paper and semi-static hedges are studied and discussed for a fairly large class of underlying price dynamics. Timing risk is identified with the uncertainty associated to the time at which the payoff payment of the barrier option is due. Starting from the work by Carr and Picron (1999), where the authors show that the timing risk can be hedged via static positions in plain vanilla options, the present paper extends the static hedge formula proposed in Carr and Picron (1999) by giving sufficient conditions to decompose a generalized timing risk into an integral of knock-in options in a multi-dimensional market model. A dedicated study of the semi-static hedge is then conducted by defining the corresponding strategy based on positions in barrier options. The proposed methodology allows to construct not only first order hedges but also higher order semi-static hedges, that can be interpreted as asymptotic expansions of the hedging error. The convergence of these higher order semi-static hedges to an exact hedge is shown. An illustration of the main theoretical results is provided for i) a symmetric case, ii) a one dimensional case, where the first order and second order hedging errors are derived in analytic closed form. The materiality of the hedging benefit gain of going from order one to order two by re-iterating the timing risk hedging strategy is discussed through numerical evidences by showing that order two can bring to more than 90% reduction of the hedging \'cost\' w.r.t. order one (depending on the specific barrier option characteristics).
---
中文摘要:
本文旨在为多维市场模型下美式期权头寸的时间风险半静态对冲提供数学贡献。本文考虑了障碍期权,并针对一类相当大的基础价格动态研究和讨论了半静态套期保值。时间风险是指与障碍期权支付到期时间相关的不确定性。从Carr和Picron(1999)的工作开始,作者证明了时间风险可以通过普通期权中的静态头寸进行对冲,本文扩展了Carr和Picron(1999)提出的静态对冲公式,给出了在多维市场模型中将广义时间风险分解为敲入期权积分的充分条件。然后,通过定义基于障碍期权头寸的相应策略,对半静态对冲进行专门研究。该方法不仅可以构造一阶套期保值,还可以构造高阶半静态套期保值,这可以解释为套期保值误差的渐近展开。这些高阶半静态套期保值收敛于精确套期保值。对于i)对称情况,ii)一维情况,给出了主要理论结果的说明,其中一阶和二阶套期保值误差以解析闭合形式导出。通过数字证据讨论了通过重新迭代定时风险对冲策略从一阶到二阶的对冲收益的重要性,表明二阶可以使一阶的对冲“成本”减少90%以上(取决于特定的障碍期权特征)。
---
分类信息:
一级分类:Quantitative Finance 数量金融学
二级分类:Pricing of Securities 证券定价
分类描述:Valuation and hedging of financial securities, their derivatives, and structured products
金融证券及其衍生产品和结构化产品的估值和套期保值
--
---
PDF下载:
-->