Leverage effect on stochastic volatility for option pricing in Hong Kong: A simulation and empirical study

This paper explores the importance of incorporating the financial leverage effect in the stochastic volatility models when pricing options. For the illustrative purpose, we first conduct the simulation experiment by using the Markov Chain Monte Carlo (MCMC) sampling method. We then make an empirical analysis by applying the volatility models to the real return data of the Hang Seng index during the period from January 1, 2013 to December 31, 2017. Our results highlight the accuracy of the stochastic volatility models with leverage in option pricing when leverage is high. In addition, the leverage effect becomes more significant as the maturity of options increases. Moreover, leverage affects the pricing of in-the-money options more than that of at-the-money and out-of-money options. Our study is therefore useful for both asset pricing and portfolio investment in the Hong Kong market where volatility is an inherent nature of the economy.     

期权型资源配置对企业竞争优势的影响

旨在打开资源基础观中组织黑箱，丰富资源配置研究成果，探讨在新竞争时代何种资源配置方式能更有效地促进企业创新特别是探索式创新，从而建立或强化企业竞争优势。通过梳理西方最新研究成果，基于我国146家企业样本，利用回归分析法检验期权型资源配置对企业竞争优势的促进作用，采取因果逐步回归法检验探索式创新在该过程中的中介作用。研究表明：期权型资源配置既能强化企业竞争优势，又能促进探索式创新；探索式创新在期权型资源配置与竞争优势间发挥部分中介作用；相对于创新的资源投入，资源配置方式对竞争优势的作用更强。     

对群众体育锻炼中，如何合理安排运动量的探讨

本文在体育锻炼能够增强体质，提高健康水平的生物学基础上和群众体育锻炼与专业训练的区别上，提出群众体育锻炼中如何合理安排运动量。     

An analysis of option pricing under systematic consumption risk using GARCH

An issue in the pricing of contingent claims is whether to account for consumption risk. This is relevant for contingent claims on stock indices, such as the FTSE 100 share price index, as investor’s desire for smooth consumption is often used to explain risk premiums on stock market portfolios, but is not used to explain risk premiums on contingent claims themselves. This paper addresses this fundamental question by allowing for consumption in an economy to be correlated with returns. Daily data on the FTSE 100 share price index are used to compare three option pricing models: the Black–Scholes option pricing model, a GARCH (1, 1) model priced under a risk-neutral framework, and a GARCH (1, 1) model priced under systematic consumption risk. The findings are that accounting for systematic consumption risk only provides improved accuracy for in-the-money call options. When the correlation between consumption and returns increases, the model that accounts for consumption risk will produce lower call option prices than observed prices for in-the-money call options. These results combined imply that the potential consumption-related premium in the market for contingent claims is constant in the case of FTSE 100 index options.     

American-style Indexed Executive Stock Options

This paper develops a new pricing model for American-style indexed executive stock options. We rely on a basic model framework and an indexation scheme first proposed by Johnson and Tian (2000a) in their analysis of European-style indexed options. Our derivation of the valuation formula represents an instructive example of the usefulness of the change-of-numeraire technique. In the paper's numerical section we implement the valuation formula and demonstrate that not only may the early exercise premium be significant but also that the delta of the American-style option is typically much larger than the delta of the otherwise identical (value-matched) European-style option. Vega is higher for indexed options than for conventional options but largely independent of whether the options are European- or American-style. This has important implications for the design of executive compensation contracts. We finally extend the analysis to cover the case where the option contracts are subject to delayed vesting. We show that for realistic parameter values, delayed vesting leads only to a moderate reduction in the value of the American-style indexed executive stock option.     

A Pricing and Hedging Comparison of Parametric and Nonparametric Approaches for American Index Options

This article investigates the extent to which options on theAustralian Stock Price Index can be explained by parametricand nonparametric option pricing techniques. In particular,comparisons are made of out-of-sample option pricing performanceand hedging performance. The dataset differs from many of thoseused previously in the empirical options pricing literaturein that it consists of American options. In addition, a broaderspectrum of techniques are considered: a spline-based nonparametrictechnique is considered in addition to the standard kernel techniques,while the performance of a Heston stochastic volatility modelis also considered. Although some evidence is found of superiorperformance by nonparametric techniques for in-sample pricing,the parametric methods exhibit a markedly better ability toexplain future prices and show superior hedging performance.     

浅论乒乓球运动对全民健身的影响及作用

随着社会的不断发展和进步,人民生活水平的日益提高,健康已成为众人的追求目标。在不断增加的健身运动中,不受条件限制,运动量相对适中,又有娱乐性质的乒乓球运动逐渐被更多的人接受并喜爱。本文从运动生理学、人体解剖学的角度出发,从理论上阐述和剖析乒乓球运动的健身价值。     

公司价值评估中管理者柔性的价值评估研究

现在公司价值评估方法往往没有考虑到对管理柔性价值定价问题。由于管理柔性价值定价是一种类似期权的定价，因此本运用Black—Scholes期权定价模型和买权卖权平价关系，定价管理柔性价值，来完善公司价值评估中的折现现金流量模型。     

肥胖对健康的危害及运动减肥

文章介绍了肥胖产生的原因及对人体健康的危害,并阐述了如何通过有效的体育运动进行减肥。