买断式回购是一种新型的交易和思维方式。不论其标的资产为何，买断式回购可以被理解为基于该标的资产的衍生合约。识别出买断式回购的支付结构就能够应用无套利法则为其定价。我们的分析表明确定买断式回购的约定价格是典型的衍生品定价问题。我们给出了无套利的约定价格必须满足的条件，并模拟了约定价格随保证金率和标的资产波动率的依赖关系；同时，本文的分析框架为考察买断式回购的相关问题提供了一个自然的参照系。利用 本文的框架，我们讨论了买断式回购卖空机制的效果以及履约保证金数额确定等问题。

IPO underpricing has been documented by many empirical papers. A lot of researchers believe this phenomenon is not isolated and happen by accident. Many theories and empirical studies have given some explanations. This paper study IPOs market in UK follow former researcher’s model. According to previous empirical studies, there are negative relation between IPOs underpricing and advisors’ reputation. But after investigating on UK’s IPOs and its underwriter (most are investment bank) during 2004 to present, I can not find strong support for this theories.

We consider the optimal intertemporal consumption and investment policy of a CARA investor who faces ¯xed and/or proportional transaction costs when trading multiple stocks. We show that when the stock returns are independent, the optimal investment policy in each stock is for the investor to keep the dollar amount invested in the stock between two constant levels and upon reaching one of these thresholds, to trade to the corresponding optimal targets. An extensive analysis of the optimal policy is conducted. This analysis reveals the signi¯cant relevance of transaction costs to the predictability and trading volume literature. We also obtain some seemingly counterintuitive results. For example, conditional on positive investment in a stock, as transaction costs increase, the average amount invested in the stock increases.

论文首先比较分析了不同组合保险策略之间的区别，据此提出价值增长型组合保险（VGPI）策略。其次，实证研究在我国证券市场中，市场行情、投资期长度对VGPI策略绩效的影响。实证发现，基于预测收益率最大股票组合的VGPI策略，在多头和震荡行情中，当要保比例越小、乘数越大，VGPI策略收益率也越大；在空头行情中，当要保比例越大、乘数越小，VGPI策略收益率却越高。在同一要保比例和同一乘数M下，随着投资期长度的增加，VGPI策略的年平均收益率也越大。

近日来，关于美国政府频频施压要求人民币升值一事闹得沸沸扬扬，各媒体争相进行报道，许多专家学者从不同角度进行分析评论、出谋划策。那么，美国到底为何要求人民币升值？升值后对中国有何影响？以及在此情况下，我们该如何应对?成为本文要回答的几个问题。

金融市场价格波动预测是一个举世公认的国际性科学难题，打破长期徘徊在以线性的、完全理性的均衡范式的现代（主流）金融学为基础的经验性预测局面，转向研究以非线性动力学为基础的金融市场价格波动数值预测，将非线性金融市场动力学的理论、模拟试验和实际观测，数据同化和计算软件的开发作为今后研究的重点，并借助数值分析天气预报、物理建模地震预测和航位推算弹道导弹等学科领域的经验，强化多学科，多部门的组织协调，在中国股市和期市开展金融市场价格波动动力学数值预测的科学试验，金融市场价格波动数值预测研究将极大地促进中国金融市场基础研究和金融风险预警系统的进一步发展。

论文系统分析了中国股市股票期望收益率决定因子，发现个股总体风险、非系统风险、自然对数流通市值、价格、净市值比率和换手率对股票期望收益率具有决定作用。并且由流通市值、价格、换手率三个因子构成的期望收益率因子模型可用于预测股票实际收益率，即由股票期望收益率最大的股票构成的组合，可以获得较高的实际收益率。

中国资本市场的系统风险根源于市场的结构矛盾特别是股票市场的结构矛盾，这些矛盾主要体现在股权割裂、博弈格局的变化和当前交易机制下的投资者结构的变动，前两者是诱发投资者信心崩溃和阻碍信心恢复的核心因素，而市场机制的完善是维持市场信心的外在保障。在可预见的期限内如果中国资本市场出现系统风险，它最有可能从股票市场最先出现，危及从股票市场向其它市场的扩散过程中，以证券公司为主的机构投资者的资产结构调整将起到重要的作用。要预防中国资本市场系统性风险出现首先要解决股票市场的结构矛盾，首要的就是尽快采取行动，不能使问题越积越大，在完善市场制度建设的同时，着手解决股权割裂问题，只有这样，才能为以股票市场为核心的中国资本市场健康发展奠定基础。

本文主要探讨了银行市场的信用风险管理。在买断式回购业务和远期交易业务推出之后，信用风险管理的重要性将逐步凸现。

We explore the source of managerial hubris in mergers and acquisitions by examining the history of deals made by individual acquirers. We find that compared to their first deals, acquirers of second and higher-order deals experience significantly more negative announcement effects. We also find that while acquisition likelihood increases in the performance associated with previous acquisitions, previous positive performance does not curb the negative wealth effects associated with future deals. We interpret these results as consistent with self-attribution bias leading to overconfidence. We also find evidence that the market anticipates future deals based on an acquirer's acquisition history and impounds such anticipation into stock prices.