Overreaction to stock market news and misevaluation of stock prices by unsophisticated investors: Evidence from the option market

This paper examines investors' option activity on value and growth stocks before earnings announcements. The main finding is that unsophisticated investors enter option positions that load up on growth stocks relative to value stocks in the days leading up to earnings announcements. This occurs despite the fact that at earnings announcements value stocks outperform growth stocks by a wide margin. The paper's results provide evidence that unsophisticated option market investors (1) overreact to past news on underlying stocks and (2) mistakenly believe that mispriced stocks will move even further away from fundamentals at impending scheduled news releases.     

商业银行管理层股票期权激励:特征及其影响因素——基于美国银行业的实证研究

本文以1996～2005年间美国43家代表性商业银行和98家制造业企业为样本,实证分析了商业银行管理层股票期权补偿激励的特征和影响因素。结果表明:商业银行管理层股票期权补偿占总报酬补偿比例的变化呈现出先升后降的倒U型趋势,商业银行管理层股票期权补偿占总报酬补偿的比例显著地低于制造业的这一比例;管理层股票期权补偿与商业银行成长机会、外部董事比例存在着显著的正相关关系,而与杠杆比率呈显著负相关;资产规模、管理层股票补偿对股票期权补偿水平的影响为负,但不显著;行业管制与管理层股票期权补偿费用的会计处理方法对银行业股票期权补偿有显著的影响。     

Specialist: The firm or the individual?: Empirical evidence from the options markets

This paper investigates the role of the individual specialist vis-à-vis that of the specialist firm on the quality of markets. While previous studies have not denied the importance of the individual, they have focused exclusively on the performance of the specialist firm. This study is the first empirical test of the specialist as an individual and his influence on market quality. By implication, it tests whether the firm is the appropriate level of analysis. Within specialist firms, we find significant differences in quoting behavior while the evidence on execution quality is mixed. Some firms are able to design an effective mechanism that enforces uniformity in goals of the members of the firm. Considering that exchanges are unable to impose such uniform performance, these firms appear to have better incentive or penalty systems in place. However, the existence of other firms where significant differences in execution quality exist, presents a challenge to policy makers, as differences in execution quality within a firm indicate that the disclosure of market quality needs to be at the post-level, not just at the firm level.     

Super-exponential growth expectations and the global financial crisis

We construct risk-neutral return probability distributions from S&P 500 options data over the decade 2003–2013, separable into pre-crisis, crisis and post-crisis regimes. The pre-crisis period is characterized by increasing realized and, especially, option-implied returns. This translates into transient unsustainable price growth that may be identified as a bubble. Granger tests detect causality running from option-implied returns to Treasury Bill yields in the pre-crisis regime with a lag of a few days, and the other way round during the post-crisis regime with much longer lags (50–200 days). This suggests a transition from an abnormal regime preceding the crisis to a “new normal” post-crisis. The difference between realized and option-implied returns remains roughly constant prior to the crisis but diverges in the post-crisis phase, which may be interpreted as an increase of the representative investor׳s risk aversion.     

Top Executive Pay in the United Kingdom: A Corporate Governance Dilemma

This study represents a first attempt in the UK literature to split total pay into salary, annual bonus and share options for the purpose of empirically verifying how each is related to executive performance. As predicted from earlier studies on total pay, salaries were found primarily determined by firm size. Contarary to prior research, however, our findings suggest a pronounced link does exist between performance and pay over both the short- and long-term. This is manifested particularly by the magnitude of the coefficient estimates found between changes in shareholders return and changes in executive share options. This finding strongly suggests that the leverage executives achieve, on average, in their rewards as share prices increase may well be substantial; a finding that has not been captured in previous research on executive remuneration and which is of considerable relevance to the current corporate governance debates.     

均值方差偏好和下方风险控制下的动态投资组合决策模型

本文在均值方差框架下，研究了下方风险控制下的动态投资组合问题。在目标函数中考虑了投资组合的最坏结果，利用标准的期权定价理论，给出了最优投资策略的解析式。该投资策略等价于一个关于“资产”最小二阶矩组合的欧式看跌期权和无风险资产的组合，而且两基金分离定理仍然成立。     

Strategic use of futures and options by commodity processors

The impacts of input–output price relationships on end-users' demands for positions in futures and options are analyzed using a mean-variance portfolio model and applied to price risk management in the bread manufacturing industry. A production relationship was assumed between the input and resultant output, and correlation between the input and output prices were introduced into the portfolio model. The optimal hedge ratio can be either positive or negative depending upon the relationship between the input and output price standard deviation adjusted for production technology and input–output price correlation. Introduction of a call option into the portfolio (in addition to the futures) does not change the hedging demand for futures; however, the speculative component changes. The results show that the addition of input–output linear production and price correlation relationships would not justify a hedging role for options unless there is bias in the futures and/or options markets.     

企业会计政策选择中的问题及对策

本文分析了我国企业会计政策选择中存在的各种问题,并提出了正确地选择适合企业自身发展的会计政策的具体方法.     

Finance models as metaphors

Quantitative models in the social science of finance such as the Capital Asset Pricing Model (CAPM) and the Black-Scholes Option Pricing Model (OPM) are metaphors. They cannot be applied literally, but do provide us with figurative knowledge—an epistemologically meaningful form that might legitimately be called a “useful framework,” as the CAPM is commonly referred to in textbooks. This paper describes the scientific value of metaphors and discusses why the OPM ought to be seen as one and what this might mean. As a result of finance research and the development of what has been called “modern finance theory,” of which the CAPM and OPM are important parts, we can certainly understand financial relationships much better, but that “understanding” is quite different from what our research methods imply that it is.     

Real Option and Strategic Decision Making of Duopoly

Other than traditional valuation methods, the real option approach captures the flexibility inherent in investment decisions to make the optimal decision of a finn in isolation from its competitors. In reality, however, the actions or decisions of competing fn-ms （practical or potential） often affect each other＇s investment opportunity. The value of the project for the firms is assumed to follow a Geometric Brownian motion, and the model combines game theory and the theory of irreversible investment under uncertainty. This paper characterizes the resulting Nash equilibrium under different assumptions on the information that the firms have each other＇s valuation for the project.