针对我国上市公司频频发生的业务“变脸”行为，本文考察了产权保护对上市公 司主营业务变更的影响。研究发现，在产权保护越差的地区，公司更易变更自己的经营主业。 进一步的研究显示，由于国有公司更多地得到政府支持，产权保护对其主业变更的影响较弱； 而对于民营企业，主业变更则显著地受到产权保护的作用。短期内，通过改变主营业务公司 业绩得到改善；但长期来看，由于竞争力的缺乏和发展后劲的不足，主业变更公司的市场表 现较差。

We investigate the role of natural culture in corporate risk-taking using measures of income variability, R&D spending, and use of long-term debt. We identify three dimensions of national culture that should influence corporate risk-taking, and we isolate the effects of country-level and firm-level variables by using a hierarchical linear modeling approach. The three specific cultural values that we study – harmony, individualism, and uncertainty avoidance-- have both direct and indirect effects on our various measures of risk-taking. These results survive when we control for firm-level and country-level characteristics.

This paper provides a parallel investigation on the impact of board composition, board activity and ownership concentration on the performance of listed Chinese firms. We find that independent directors enhance firm performance effectively than other board factors. The frequency of shareholder meetings, rather than board meetings, is positively associated with firm value. Tradable share ownership concentration has a positive and linear relationship with firm value, while state and total share ownership concentration represent U(V) shapes. Importantly, companies with the highest levels of both total share and tradable share ownership concentration have a greater firm values than companies with the highest levels of only a single concentration.

Recent researches suggest that private benefits of control of managers are a key predictor of acquisition performance and that there exists a negative correlation between measures of private benefits and acquirer announcement returns. However, empirical evidence has not confirmed such a negative relationship. The study in this paper shows that this relationship between private benefits of control of managers and acquisition performance may depend on the level of government shareholding. The study is based on an analysis of a sample of 246 M&A events from the listed companies of Chinese state-controlled enterprises, during the period 2001-2006 and it reveals that, under a low level of government shareholding, private benefits of control are positively correlated with the performance of acquiring firm; but private benefits of control are negatively correlated with the performance of acquiring firm under high government shareholding. Results also indicate that the private benefits of control of managers are important determinants of the acquiring firm performance. These findings sharpen the current understanding of the relationship between private benefits of control of managers and acquiring firm performance.

经济实力是决定货币国际地位的基本因素，信心、流动性与交易网络支撑着国际货币职能的发挥，但一国的经济实力并不必然转换为货币实力，政治的影响不能被忽视。无论以何种标准衡量，美元堪称世界的顶级货币，但其协商货币色彩愈加浓厚，美元地位的维持要借助在位货币的优势和外力支持。虽然美元的未来存在不确定因素，但目前尚无任何货币具备超越美元的实力，美元地位的下降将是一个漫长的过程。人民币国际化符合中国国家利益，需要国家意志和外交战略的支持。

发达的金融市场是支撑储备货币地位的必要条件。本文以货币职能分类为视角，分析与比较在国际储备货币竞争之后的金融市场数据。凭借金融市场规模、信用质量和流动性等方面的优势，美元在国际储备体系中的领先地位依然明显。欧元的诞生促进了欧元区金融市场的发展，但其市场广度和深度仍落后于美元市场，而欧元区金融市场的进一步整合会增强欧元作为储备货币的吸引力。

沿袭金融物理学的研究思路和框架，选取上证指数从1990年12月19日至2010年3月22日的日收盘价和日收益率作为样本数据，对中国股票市场的自组织临界性和对数周期幂律进行实证研究。首先，将整个样本期分为14个阶段，包括7个市场上升期和7个市场下跌期，分别在这14个时期对上证指数日收盘价进行LPPL拟合。泡沫、反转泡沫、反泡沫分别被探测到，值得注意的是，我们发现了一个新的价格演化特性——反转反泡沫。其次，考察粗粒持续损失，将崩盘定义为最大的四个粗粒持续损失。关于粗粒持续损失提出了三个假设，并运用样本数据对这三个假设进行了检验。

公共品提供过程中的腐败作为制约经济发展的因素已广受关注，然而在中国，解决腐败问题的理论并不多。Baron and Myerson及其追随者提出了对垄断者进行规制的方法。本文试图拓展Baron and Myerson规制方式来解决官僚社会中官僚腐败问题，证明制度对人行为的影响。通过对委托代理过程的阶段分析，系统性官员腐败这一结论被证明，并提出了两种可显著减少腐败的方法。

本文针对近年来国际贸易保护主义重新抬头的趋势，对贸易保护的内生决定与 利益集团的作用进行了政治经济学角度的分析。发达国家对传统产业进行贸易保护的现象背 后是更深层次的利益集团的博弈。对于国际重新分工的格局，发达国家似乎并没有做好充分 的准备，其国内产业结构的调整速度明显滞后。我们应该在发挥我国现阶段比较优势的同时， 努力克服过度依赖外需的潜在系统性风险，有效缓和来自西方利益集团的压力，从而实现通 过拉动内需来提升就业水平和促进经济均衡发展的目标。

面对危机的挑战，各国政府都采取了凯恩斯主义的积极干预经济的政策，大幅减税、增加财政支出及放松银根以刺激经济，但目前政策的实际效果尚未明显体现。在此背景下，部分国家为了自己尽快摆脱危机，提出了一些有明显保护主义倾向的方案，与西方国家一直积极倡导的自由市场经济背道而驰。下文将对近期国际社会保护主义重新抬头的趋势、支持保护主义的学术观点及其影响等问题进行简要分析。