Tighter Option Bounds from Multiple Exercise Prices

Optionbounds are determined by state discount factors limited by prices of a riskless bond and the underlying asset. Usually the asset has at least two market-traded options for each maturity, further limiting the factors. Tighter bounds result from incorporating the prices of all existing options of the same maturity. The tightened bounds are particularly applicable to appraising the consistency of all options trading on a single underlying security, notably index options. Constructed examples indicate a potential improvement of eighty percent in bound width; index data reveals a lower reduction, but extensive arbitrage opportunities from violations of the tighter bounds. This revised version was published online in November 2006 with corrections to the Cover Date.     

对"认股权证"理论价值修正的实证分析

认股权证在许多方面既类似于又不同于看涨期权。影响其价值的因素比普通的期权复杂。本文应用连续时问金融中的经典模型——公司资本定价模型，从公司价值的角度出发，同时考虑股本稀释与现金流流入效应，对认股权证的理论价值进行分析，并以宝钢G股欧式认服权证为例做实证分析。     

亚式期权定价的模拟方法研究

由于算术平均价格亚式期权的定价没有解析公式，所以文章用Monte Carlo模拟方法通过Matlab软件编写程序对亚式期权进行了定价。发现在某些情况下，亚式期权的价值并不是国内外一些研究者所认为的低于相应的欧式期权的价值。     

Good-Deal Option Price Bounds for a Non-Traded Event with Stochastic Return: A Note

Cochrane and Sa'a-Requejo (2000, Journal of Political Economy) proposed the good-deal price bounds for the European call option on an event that is not a traded asset, but is correlated with a traded asset that can be used as an approximate hedge. One remarkable feature of their model is that the return on an event process explicitly appears in the option price bounds formula, which offered a contrast with the standard option pricing model. We show that the good-deal option price bounds on a non-traded event are obtained as a closed-form formula, when the return on an event is governed by a mean reverting process.     

A Note on Option Pricing for the Constant Elasticity of Variance Model

We study the arbitrage free optionpricing problem for the constant elasticity of variance (CEV) model. To treatthestochastic aspect of the CEV model, we direct attention to the relationship between the CEV modeland squared Bessel processes. Then we show the existence of a unique equivalentmartingale measure and derive the Cox's arbitrage free option pricing formulathrough the properties of squared Bessel processes. Finally we show that the CEVmodel admits arbitrage opportunities when it is conditioned to be strictlypositive.     

经理人股票期权会计确认的探讨

经理人股票期权的确认问题是亟待解决的会计理论和实践问题。经理人股票期权的经济实质是企业经理人参与企业剩余索取权的分享。经理人股票期权是一项无形资产,应在经理人提供劳动期间内,将其平均摊销。应改革现行的财务会计观念与模式,增设“待转股本准备”科目,以适应企业经理人参与现代企业剩余索取权分享的现实。     

On the Target Option and Realization of Economic Benefit Auditing

经济效益审计在国外已经实行多年,而我国尚处在起步阶段。多年来,我国的审计工作一直停留在合法性、合理性层面上,开展经济效益审计,既是审计工作发展的必然趋势,也是与国际惯例接轨的需要。本文从经济效益审计的目标选择与实现等方面入手,对经济效益审计目标的选择与实现做了重点阐述,并结合现状对未来的经济效益审计工作提出了几点可行性的意见与建议。     

On the Distribution of CBOE Option Trade Prices Occurring Between Consecutive Stock Trades

This paper examines the volume distribution of option trade prices that occurs when the underlying stock price remains constant. The width of these option trade price bands provides direct evidence on the law of one price and the redundancy of options assumed in many option models. We find that index option bands are narrower than equity option bands. Furthermore, for both equity and index options, puts have narrower bandwidths than calls. In general, option price bandwidth is narrow and can be explained by the minimum price movement allowed by the Chicago Board Options Exchanges (CBOE). This supports the single price law and the redundancy assumption. The existence of bid/ask quotes on the option does not materially affect the above results although it does alter the frequency of multiple option trade prices for a given underlying stock price. We note that over 53% of option trading volume occurs without bid/ask quotes on the CBOE compared to less than 15% a decade ago. Our results suggest that the effective bid/ask spread on options is probably no larger than the minimum price movements allowed by the CBOE. Furthermore, the need for the liquidity services of market makers may be declining if the decline in quoting activity stems from cross trading (i.e. trades not involving market makers).     

股票期权的个人所得税问题探讨

股票期权制度是一种新型的薪酬激励制度。股票期权制度作为富有成效的激励制度之一，在发达国家得到了广泛的应用，已成为市场经济国家和地区的企业对员工进行长期激励的非常普遍的方式。近两年来，股票期权成为我国企业改革和发展的一个热门话题，并在部分企业开始实施。如何针对股票期权所得的特点，并借鉴国外经验，制定相应的税收政策，是我们迫切需要解决的问题。本对我国股票期权所得税目、纳税义务发生时间、计税依据、税收优惠及税收征管等作了较为详细的探讨。     

基于教学主体的视角谈高校双语教学的策略选择

近年来,双语教学在全国不少地区拉开帷幕,成为我国当前教育改革的一个亮点,越来越多的高校和教师青睐双语教学,实践双语教学.本文从双语教学的含义及理论基础人手,提出高校开展双语教学应遵循的四大基本原则,进而以教学主体为切入点,阐述提升高校双语教学效果的策略选择.     

Option strategies: Good deals and margin calls

We provide evidence that trading frictions have an economically important impact on the execution and the profitability of option strategies that involve writing out-of-the-money put options. Margin requirements, in particular, limit the notional amount of capital that can be invested in the strategies and force investors to close down positions and realize losses. The economic effect of frictions is stronger when the investor seeks to write options more aggressively. Although margins are effective in reducing counterparty default risk, they also impose a friction that limits investors from supplying liquidity to the option market.     

Upper and Lower Bounds of Put and Call Option Value: Stochastic Dominance Approach

Applying stochastic dominance rules with borrowing and lending at the risk-free interest rate, we derive upper and lower values for an option price for all unconstrained utility functions and alternatively for concave utility functions. The derivation of these bounds is quite general and fits any kind of stock price distribution as long as it is characterized by a “nonnegative beta.” Transaction costs and taxes can be easily incorporated in the model presented here since investors are not required to revise their portfolios continuously. The “price” that is paid for this generalization is that a range of values rather than a unique value is obtained.     

人民币外汇期权市场定价分析和政策研究

人民币外汇期权市场在逐步发展当中,针对其定价水平的分析研究方兴未艾。从构造两种不同的套利组合出发,对两个期限不同在值水平的人民币外汇期权进行了套利分析,发现：人民币外汇期权市场定价偏高,长期限期权定价更高。对此分析了其中原因,并给出了相应的政策建议。     

Two Closed-Form Formulas for the Futures Price in the Presence of a Quality Option

The paper derives closed-form formulas for the futures price in the presence of a multi-asset quality option. This is done for two cases: In the first one the underlying assets are zero coupon bonds with different maturities in the single-factor Vasicek model. In the second one these are commodities in a multi-factor setting, again with Vasicek interest rate uncertainty.     

Two Closed-Form Formulas for the Futures Price in the Presence of a Quality Option

The paper derives closed-form formulas for the futures pricein the presence of a multi-asset quality option. This is donefor two cases: In the first one the underlying assets are zerocoupon bonds with different maturities in the single-factorVasicek model. In the second one these are commodities in amulti-factor setting, again with Vasicek interest rate uncertainty.     

关于股票期权会计若干问题的探讨

随着我国企业改革的深化与市场经济的确立与完善，在企业中探索一种科学有效的激励机制已成为一个亟等解决的课题，股标期权制度作为近年来在西方国家中行之有效的一种企业激励机制，在我国也吸引了越来越多的注意力。本文在对股标期权概念及其激励作用进行分析的基础上，对股票期权的确认时机、股票期权的计量和设计股标期权应注意的问题进行了探讨。     

Arbitrage Bounds and UK Unit Trust Performance

Abstract:  We use the arbitrage performance bounds of Ahn, Cao and Chretien (2003) to evaluate UK unit trust performance between January 1988 and December 2002. We find that trust performance is sensitive to the admissible stochastic discount factor used for both the average trust and the majority of individual trusts. The investment style, size, load charge, and annual charge of the trust all have an impact on trust performance. We find for some trusts, the Jensen (1968) and Ferson and Schadt (1996) measures do not satisfy arbitrage bounds by the base assets.     

Option pricing with random volatilities in complete markets

This article presents the theory of option pricing with random volatilities in complete markets. As such, it makes two contributions. First, the newly developed martingale measure technique is used to synthesize results dating from Merton (1973) through Eisenberg, (1985, 1987). This synthesis illustrates how Merton's formula, the CEV formula, and the Black-Scholes formula are special cases of the random volatility model derived herein. The impossibility of obtaining a self-financing trading strategy to duplicate an option in incomplete markets is demonstrated. This omission is important because option pricing models are often used for risk management, which requires the construction of synthetic options.Second, we derive a new formula, which is easy to interpret and easy to program, for pricing options given a random volatility. This formula (for a European call option) is seen to be a weighted average of Black-Scholes values, and is consistent with recent empirical studies finding evidence of mean-reversion in volatilities.Helpful comments from an anonymous referee are greatly appreciated.     

Option Bounds and the Pricing of the Volatility Smile

This paper presents a new approach forthe estimation of the risk-neutral probability distribution impliedby observed option prices in the presence of a non-horizontalvolatility smile. This approach is based on theoretical considerationsderived from option pricing in incomplete markets. Instead ofa single distribution, a pair of risk-neutral distributions areestimated, that bracket the option prices defined by the volatilitybid/ask midpoint. These distributions define upper and lowerbounds on option prices that are consistent with the observableoption parameters and are the tightest ones possible, in thesense of minimizing the distance between the option upper andlower bounds. The application of the new approach to a sampleof observations on the S&P 500 option market showsthat the bounds produces are quite tight, and also that theirderivation is robust to the presence of violations of arbitragerelations in option quotes, which cause many other methods tofail.     

对股票期权的思考--股票期权在我国企业的适用性研究

起源于美国的股票期权制度在其本土已经得到了较为广泛的应用，我国在这方面也进行了积极的探索，一些企业也进行了实践。但股票期权究竟是否适合我国的情况呢?本将以主板市场为基础，通过对股票期权的实施条件的分析来对其在我国企业的适用性进行研究。