We examine the independent and dominating effects of the liquidity level, the information asymmetry and the divergence of opinion on asset returns in an important emerging market, Chinese stock market. We use the variable ILLIQ from Amihud (2002) to proxy for the liquidity level, the variable PIN from Easley, Hvidkjaer, and O'Hara (2002) to proxy for the information asymmetry and the variable OBS based on Nas and Skjeltorp (2006) to proxy for the divergence of opinion. We find striking evidence that stocks with a higher liquidity level, or a lower information asymmetry, or a higher divergence of opinion, experience significantly lower excess returns. More importantly, the explanatory power of the liquidity level on asset returns may only reflect those from the information asymmetry and the divergence of opinion. Moreover, we find no evidence on the dominating effect between the information asymmetry and the divergence of opinion when examining their impact on asset returns.

对期货市场最佳套期保值比率的研究可分为两大类：一类是从组合资产收益风险最小化的角度，研究最小风险套期保值比率；另一类是同时考虑组合资产收益和收益方差，从效用最大化的角度研究均值－风险套期保值比率。研究套期保值的模型方法一般运用以下六种: 传统回归模型（OLS）、双变量向量自回归模型（B-VAR）、误差修正套期保值模型（ECHM）、广义自回归条件异方差模型（EC-GARCH）、VaR最小方差套期保值方法（VaR）、基于几何谱风险测度GM的期货套期保值模型（GM）。本文比较了以上六种模型方法各自的优势和缺陷。

When the government is simultaneously the owner and regulator of the securities market, the evolution of securities market regulation follows a path of compulsory institutional change. China’s government authorities have played a dual role in this process by acting both as the securities market regulator and the controlling owner of the stock exchanges. This paper uses the evolution of China’s securities market regulation from 1980 to 2007 to illustrate this theoretical framework. It provides unique evidence of how securities regulation evolves in response to government direction and supervision if the government is both the owner and the regulator of the securities market.

Using a sample of China’s partially privatized state-owned enterprises (SOEs) that have emerged in the global equity markets, this paper examines the decision to list overseas and its consequences. We find that overseas listing of Chinese SOEs is primarily determined by political needs, not by firms’ desire to fund growth and expand foreign sales. In addition, we find that overseas listed SOEs have more professional boards of directors, use greater accounting conservatism, exhibit higher investment efficiency, and have better one-year and two-year post-listing stock performance than their domestically listed counterparts. Additional analysis exploring the impact of political relations on overseas listing effects finds that strong political connections weaken the overseas listing effect on investment efficiency and post-listing stock performance, consistent with the positive overseas listing effect on investment efficiency being attenuated by government influence to satisfy state objectives such as excess employment. Taken together, our study suggests that overseas listing provides a mechanism for constraining politicians’ pursuit of private benefits and improving efficiency for partially privatized Chinese SOEs. However, the effectiveness of this mechanism is limited for SOEs with strong ties to the government.

本文目的是研究我国投资者法律保护、股权结构与公司价值的关系。近些年的公司治理文献中，“隧道效应”，即公司控股股东牺牲中小股东利益以自利，引起了广泛关注。本文中我们构建了一个简单模型，考察公司治理的内外部机制——内部股权结构与外部法律和监管——对该效应的抑制，并分析了它们对于公司价值的影响。最后利用我国110家上市公司的面板数据检验了理论模型的预测。实证表明，好的投资者保护和适当的股权结构都有利于提升公司价值。

本文通过检查基金管理公司内部治理对开放式基金业绩、规模和资金流的影响，发现：一股独大，董事会规模、内部董事比例和督察长有负面治理效应；均分股权、监事会规模、内部监事比例和投资决策委员有正面治理效应；独立董事比例高能吸引资金流，但对业绩无影响。基金管理公司采用均分股权模式、扩大监事会规模、提高内部监事比例与独立董事比例、强化督察长监督职能是改善基金治理的有效途径。

已有理论研究表明，资本结构与企业产品市场竞争绩效之间既可能存在单调正或单调负的线性关系，也可能存在非线性关系。本文通过相对行业而言的企业销售收入增长率指标来反映企业产品市场竞争绩效，并使用我国上市公司2000-2006年的数据进行了实证分析。结果发现，我国上市公司相对销售收入增长率与资产负债率存在“U型”关系：当负债处在较低水平时，增量负债恶化了企业产品市场竞争绩效；一旦负债超过临界值，适度增量负债则改善企业产品市场竞争绩效。本文的研究表明，我国上市公司产品市场竞争绩效与资本结构之间存在非线性关系。

期货市场的一大功能是套期保值，因此套期保值效果是衡量股指期货标的指数优劣的一个重要指标。本文根据组合投资套期保值理论，运用最小方差法，以中标50和道中88指数模拟现货股票投资组合，实证分析了五只我国统一市场基准指数新富A200、沪深300、中标300、新富A600和道中600的套期保值效果，结果显示新富A600的套期保值效果最佳。

本文应用条件极值法对中国股市的金融风险进行测量，并用无条件覆盖率和条件覆盖率检验来考察其测量的准确程度。检验的结果表明该方法能更加准确的描述金融机构所面临的风险。条件极值法的优越性体现在两个方面：（1）并非基于全部时间序列数据而是基于数据的尾部建模，这能更精确的刻画数据的极值特征。（2）考虑了金融时间序列数据分布的时变特征。正是由于条件极值法更充分有效的利用了数据信息，因此它能更精确的捕捉到金融市场上极值事件的发生率和发生程度。基于似然比率检验的结果表明，用条件极值法计算出的VaR值比用传统的分布计算出的VaR值更为精确。

信用衍生产品是有效分散、转移以及对冲信用风险的重要工具。2007年，全面爆发的美国次贷危机，导致了严重的违约集聚现象，致使现有的信用衍生品定价模型面临极大的挑战，因此，如何对信用衍生品进行准确定价成为学者们研究的焦点。为了更好的描述这种现象，本文利用Levy过程刻画违约密度的跳跃结构，构建了一种更为一般的仿射跳跃模型。对于组合信用衍生品定价模型的数值模拟结果显示，与传统的定价模型相比，这种结构可以很好地描述违约的集聚现象。文章最后，给出了该模型的扩展方向。