银行信贷与房地产价格有着千丝万缕的联系。Pavlov 和Wachter 清晰地阐述 了商业银行对抵押贷款看跌期权内在价值的低估导致资产价格膨胀，使其脱离基础价值，即 产生泡沫。但是其假设条件缺乏一般性，并且没有考虑开放条件下的汇率风险。本文在对其 假设条件进行修正，并添加汇率因素的基础上，对PW 模型进行扩展，从而得出开放条件下 商业银行最优化行为与房地产价格泡沫的相关分析模型。最后，采用我国2005 年7 月至2008 年9 月的月度数据进行计量分析，基本证实了模型的结论：房地产价格与利差和汇率负相关， 与存款利率正相关。

本文构建VAR-BEKK-GARCH模型从市场波动联动的角度考察沪深股市间短期的波动溢出效应和长期的波动协同持续性，并在此基础上分析了沪深股市间的时变相关性。实证结果表明：短期内，沪深股市间存在显著的双向波动溢出效应，但长期内沪深股市间不存在波动的协同持续性。沪深股市间长短期波动特征的背离以及沪深股市对数价格序列长期内不存在协整关系的事实表明尽管两市短期内表现出较强的联动特征，但长远来看它们有各自的变化方式，不在一个协同体系内，会随着时间的推移而分道扬镳。同时，对沪深股市时变相关性的研究表明，总体而言，沪深股市间存在较高的相关性，但在市场暴跌的极端市场形态下相关性有可能急剧下降。股市波动剧烈时，市场相关系数的波幅也较大，相关性较低。

美国金融危机的爆发引发了学术界对主流CDO定价模型的反思。本文认为标准的CDO定价模型既无法准确评估标的资产池的风险，又未能考虑突发性系统性冲击、债务人信用品质变化对资产池损失的影响。为此，本文在因子Copula模型的框架内考虑相互关联的市场风险和信用风险因素对CDO定价关键参数（违约概率、违约相关性、违约损失率）的影响，提出了CDO定价的风险整合模型。同时，通过Copula—Garch模型引入风险驱动因子的时序特征，对静态整合模型进行了动态扩展。实证结果表明，相比整合模型，标准模型极大地低估了高级分券的价格。对风险驱动因子假设的不同是造成二者差异的主要原因。

We investigate the information cost of stock trading during the 2000 presidential election. We find that the uncertainty of the election induces information asymmetry of politically sensitive firms under the Bush/Gore platforms. The unusual delay in election results in a significant increase in the adverse selection component of trading cost of politically sensitive stocks. Cross-sectional variations in bid-ask spreads are significantly and positively related to changes in information cost, controlling for the effects of liquidity cost and stock characteristics. This empirical evidence is robust to different estimation methods.

We evaluate the efficacy of price discovery in the round-the-clock U.S. Treasury market. Using a comprehensive intraday database, we explore informational role of trades over the 24-hour day. We find that information asymmetry is generally highest in the preopen period and lowest in the postclose period. Information asymmetry in the overnight period is comparable to that in the regular trading period. However, on days with macroeconomic announcements, information asymmetry peaks shortly after the news release at 8:30. Moreover, information asymmetry is higher on Monday morning and higher immediately before than after the open of U.S. Treasury futures trading. Although volume is low after hours and trading cost is relatively high, overnight trading generates significant price discovery. Results suggest that overnight trading activity is an important part of the Treasury price discovery process.

在文章的最初部分介绍了投资组合理论与Copula，然后给出基于概率p0的收益率等定义，建立基于概率p0的收益率的投资组合选择模型并给出具体解法，接着通过选取上证领先指数与深证领先指数2004年9月1日至2006年5月26日的日收盘数据进行实证分析，我们发现在收益率（基于概率p0的收益率）一定的情况下，通过投资组合可以降低风险。

This paper tests the smart money effects about equity mutual fund flow, and provides some good sights for the international investments. First, it provides some evidence of the outperformance of equity mutual funds using Chinese equity mutual fund data. Then it studies the determinants of mutual fund total net flows, individual net flows, and institutional net flows, and finds that the proportion fee plays an important role. Most importantly, I test the “smart money” effects, confirm its existence, and conclude that institutional net flows are smarter than individual net flows. Finally, I find that the proportion fee has a significant signal effect to direct the net flow of the new money.

基于CRTT模型，运用广义矩估计（GMM）方法，采用高频数据，按照股本规模大小分类，对沪深A股市场的磁石效应进行了实证分析。实证结果表明：沪深A股市场的涨跌幅限制存在显著的磁石效应。大规模股票和小规模股票的跌幅限制的磁石效应更加明显；中等规模股票涨跌幅限制的磁石效应具有一定的对称特征。我国的涨跌幅限制应该采取更加灵活的幅度限制，以促进股市的平稳健康发展。

Trading constraints with unspecified constraint horizon are imposed on the shares held by the state in the IPO of each listed firm in China Stock Market. In 2005, a so-called Split Share Structure Reform (also known as Division Reform) was launched in which the holders of restricted shares give up a proportion of their shares to purchase the right to terminate the trading constraint. From the size of the compensation, we infer the value of restricted shares and find that their price discounts are negatively affected by the restriction looseness captured by our proposed new multi-dimensional measure and positively affected by the bargaining power of the holders of freely-traded shares.

We use an implicit alternating direction (IAD) numerical procedure to estimate the value of a fixed-rate mortgage (FRM) with embedded default and prepayment options. The value of FRMs depends on interest rates, the house value, and mortgage maturity. Our numerical results suggest that the joint option value of prepayment and default is considerably high, even at loan origination. We extend the model to include prepayment penalties in FRM valuation.