本文基于理性预期框架研究了卖空约束对市场质量（包括流动性、私人信息的揭示程度以及波动性）以及资产价格的影响。研究结论表明，与卖空约束不起作用时相比，卖空约束起作用时进入市场的私人信息总量更少，信噪比更低，因而价格的信息含量（或信息效率）更低，这将使得风险资产供给量的不确定性对价格的冲击更大，即相同数量的指令对其价格变化的影响更大，并且均衡价格对私人信息的反应程度更弱，因而卖空约束起作用时的市场质量更差，表现为流动性更差、私人信息揭示程度更低、波动率更高。而随着不受卖空约束而进入市场的知情交易者比例增大，市场质量会逐渐转好。同时，卖空约束起作用时进入市场的私人信息总量减少会导致市场信息不对称程度提高，使得交易者平均意义上要求更高的预期收益率作为补偿，从而最后的均衡资产价格不是高估而是下跌。研究结果为Boehmer et al.（2009）等关于卖空约束的最新实证研究结果提供了较好的理论支撑。

本文对香港恒生指数期权隐含波动率表面动态过程进行了实证建模和估计，建立 起了一个五因子随机隐含波动率模型。在模型的估计方法上，本文首次引入了基于小样本面 板数据的扩展的卡尔曼滤波法。结果显示，在香港市场上，扩展的卡尔曼滤波法比传统的两 步法可以得到更好的估计结果，本文建立起来的五因子随机隐含波动率模型能很好地刻画恒 指期权隐含波动率表面的变动规律，效果明显优于静态隐含波动率模型。

随机贴现因子理论是资产定价理论的方法之一。本文把习惯形成加入到Epstein and Zin 的广义预期效用模型中，得到该模型下的随机贴现因子。计算随机贴现因子的最大的下 界。利用中国1995-2008 年居民消费支出数值模拟最大Sharpe 比率，和用中国股票市场的 年度数据实际计算的Sharpe 比率相比较，理论与经验是相符合的。

在境外NDF 市场和境内结售汇市场上，人民币远期汇率表现出明显的价格差 异，并且这种差价呈现出系统性和持续性的特征。是什么原因造成了这种现象？目前还没有 规范的解释。我们认识到由于监管环境的不同，境内外两个市场的交易主体进而交易本身的 存在着巨大差别：境内市场主要是套期保值者、中央银行和套利者之间的交易，而境外NDF 市场则是套期保值者、投机者和套利者之间的交易。然后我们依据现代远期汇率理论，考虑 预期行为并引入抛补利率平价理论分别构造出两个市场的远期均衡汇率定价模型，给出了远 期汇率差价现象的一个理论解释，并相应提出了完善人民币定价机制的政策建议。

资产价格波动会影响企业净资产，尤其在金融危机期间，会恶化企业资产负债表，提高企业融资成本和降低企业资金需求，引起投资和产量萎缩，实体经济下滑。本文得到的宏观经验事实是资产价格波动单向影响实体经济波动，为此构建资产价格波动影响企业投资行为的微观理论模型，并进一步提供微观经验证据。结果表明：资产价格波动通过资产负债表渠道并没有显著影响融资能力较强的企业，而只是冲击到融资能力弱的企业；实施新会计规则之后，资产价格波动借助资产负债表渠道影响企业投资行为的效果更明显。政策内涵是：公允价值会计规则会借助资产负债表放大资产价格波动效应，需要通过资本缓冲、前瞻性储备和更加透明的信息披露来解决；扩张性宏观经济政策需考虑私人经济主体是否具有资金需求，纳入资产负债表信息到政府经济政策框架中。

提出了一种新的评价方法，用于评价波动率模型。该方法兼顾了模型拟合样本的能力和模型的平滑性，而避免了经典的评价方法只考虑模型拟合样本能力的缺陷。新方法有利于投资者挑选出交易成本相对较低的和风险对冲能力相对较强的波动率模型。实证例子是估计中国股票市场的行业时变风险：对三大类波动率模型进行了评价，并指出评价方法或标准的选择直接影响金融市场风险估计或预测的评价结果。

本文以制度经济学的审视角度，深入分析了金融监管提示的必要性、可能性与现实性，并结合当前银行业监管的实际，对监管提示的层次、顺序、内容等进行了写实性描述，进一步研究了金融监管提示制度的功能效应，比较分析现行不完整提示制度的不足，从而得出“灵活的金融监管提示制度有利于银行业的发展、效率和稳定，从而科学地推动社会经济的发展”的结论。

Using a proprietary dataset collected through a survey targeted to VC funds in Mainland China, we examine the impact of constructing VCs’ firms portfolio from industrial organization perspective on investment efficiency, portfolio size and structure of profit sharing. The results indicate that constructing VCs’ firms portfolio from industrial organization perspective improves investment efficiency because it reduces over investment and increases investment return. Moreover, it also further explains the disparities of VC’s portfolio size and structure of profit sharing between Mainland China and Western Countries. Additional tests provide evidence to suggest that the government assistance to VC industry has obvious political objectives in Mainland China.

This paper studies idiosyncratic risk of new ventures. An option-based model of a new venture with multistage investments and jumps is developed. Our model ex- plains (1) why new ventures?idiosyncratic volatility eventually decreases as they clear R&D investment stages and become mature ?rms ?the stage-clearing e¤ect; (2) the negative relation between jumps in value and subsequent idiosyncratic volatility ?the jump e¤ect; (3) the dynamics of idiosyncratic volatility under di¤erent schedules of staged venture capital investments; and (4) the e¤ect of di¤erent schedules of staged investments on ?rm valuation with the presence of jumps. Empirically, we develop a generalized Markov-Switching EARCH model to simultaneously capture structural changes in ?rms?idiosyncratic volatility and the relation between jumps and idiosyn- cratic volatility. Using a hand-collected dataset of early-stage biotech ?rms, we ?nd empirical evidence supporting the jump e¤ect and the stage-clearing e¤ect described by our model.

We empirically examine the role of venture capital in VC-backed listed firms in Mainland China using the data of SME Board of ShenZhen Stock Exchange from June 2004 to June 2007. Contrary to the evidence from the US, we find that the VC-backed firms in Mainland China experience higher underpricing, which is not owing to the lower pricing in the primary market but the investors in the second market are too optimistic about the prospect of the VC-backed firms. In addition, the pre- and post-IPO operating performance of VC-backed firms is significantly better than that of nonVC-backed ones. Our finding supports the monitoring hypothesis that the VC-backed firms perform better than nonVC-backed firms before and after IPO for the monitoring of VC funds. Moreover, it is found that high-reputation VC-backed firms have a better post-IPO operating and market performance compared to low-reputation VC-backed ones, which is consistent with the grandstanding hypothesis proposed by Gompers (1996). However, there is no evidence to support the certification hypothesis proposed by Megginson and Weiss (1990) that VC-backed firms have a lower underpricing in the IPO performance.