社保基金持股信息的市场反应——基于中国资本市场数据

在阐释社保基金及其投资情况和相关理论的基础上,采用超额收益法和多元回归分析法,分析我国资本市场对2009年四个季度和2010前两个季度公布的社保基金持股信息的反应。研究结果显示,资本市场对社保基金持股信息具有强烈的市场反应,被社保基金持股的上市公司股价超额收益非常明显。造成这种现象的原因除了社保基金管理者对股市精准把握外,我国资本市场的效率不足、信息不对称及社会保险基金会计信息披露的缺陷也是重要原因。因此,我国应加强公司治理,提高资本市场效率,规范社保基金会计信息披露。     

新冠肺炎疫情冲击下企业现金持有的预防价值研究

最近爆发的新冠肺炎疫情牵动着亿万民众的心,面对突如其来的疫情,企业资金面临着巨大压力。企业持有现金主要源于预防和交易动机,然而预防动机的特性决定了其在企业正常经营状态下难以直观体现,因而目前鲜有研究对企业现金持有的预防价值进行直接检验。本文以新冠肺炎疫情事件的冲击为研究切入点,通过考察不同现金持有水平的企业在面临危机冲击的市场反应,发现企业现金持有水平与事件窗口期内的累计超额收益率呈显著正相关关系,从而为现金持有的预防价值提供了更为直接的经验证据。而且,当公司受疫情冲击程度越大时,二者之间正相关关系越强。进一步发现,企业现金持有的预防价值在企业现金流压力大以及外部融资环境较差时更加凸显。本研究丰富了已有关于现金持有预防价值的相关文献,并对政府与企业应采取何种举措以应对突发事件具有一定的启示。     

Does religiosity enhance the quality of management earnings forecasts?

This study investigates whether firms located in areas with higher levels of religiosity disclose higher-quality management earnings forecasts than do other firms. Using a US sample of 4,655 firm-year observations over the period 2001 to 2014, we find that firms headquartered in counties with higher proportions of religious adherents issue earnings forecasts that are less optimistically biased and that the effect of religiosity is concentrated in firms with weak monitoring mechanisms. We also find that religiosity mitigates pessimistic bias in management earnings forecasts, but only for those issued by firms operating in low litigation industries. This result suggests that when the litigation risk is high, both ethicality and risk aversion are at work and their competing effects likely offset each other. Additionally, we document that forecasts issued by firms in more religious areas trigger stronger stock price reactions than those issued by other firms and that the effect is limited to forecasts containing optimistic bias. Overall, our results show that religiosity enhances the quality of management earnings forecasts, but the effect varies based on different conditions.     

壬二酸研究的进展

介绍了近年来臭氧法,双氧水法,高锰酸钾法等制备壬二酸的新进展,并对臭氧法制备壬二酸的机理进行了初步探讨.     

创业企业即兴行为研究现状探析与未来展望

利用手边当时可得的资源即时地构建和执行应对策略的即兴行为是创业企业应对环境不确定性、克服资源短缺困境的常见选择。尽管过去十五年来创业企业即兴行为(entrepreneurial improvisation,EI)的研究获得了蓬勃发展,但研究成果相对碎片化,散乱且未经系统梳理的研究阻碍了其发展成为一个有前途的研究领域。本文从创业即兴概念内涵、前置变量(触发因素和发生条件)以及结果变量等方面出发,对现有创业企业即兴行为研究进行分析和总结,并在此基础上进一步细化研究的概念框架,从创业即兴的特征与分类、内部组织因素和外部环境因素对创业即兴的影响、创业即兴对企业持续性创新的影响等方面提炼了值得未来研究密切关注的前沿主题。借此赋予创业即兴这一概念以研究的合理性和前景性,帮助引导创业者/创业团队思考即兴行为的重要性,以进一步推进其在创业实践及研究过程中的发展。     

中国上市公司管理层收购的股价反应——与投资者市场行为理性的对照检验

本文采用标准事件研究法来考察管理层收购(MBO)在中国证券市场的股价反应。与在国外给公众股东带来巨大溢价形成对比的是,MBO在中国没有给流通股东带来收益,市场对MBO公告没有做出任何显著反应。进一步对中国投资者是否具有理性进行检验和比较后发现投资者是理性的,MBO在中国既不属于“利好”,也不属于“利空”,且似乎有市场操纵嫌疑,必须进一步规范。     

The effect of the Rana Plaza disaster on shareholder wealth of retailers: Implications for sourcing strategies and supply chain governance

Supply chain and reputational risks are often assumed to motivate firms to source production in developed, high-cost countries rather than developing, low-cost countries. To examine this assumption, we provide evidence from the collapse of the Rana Plaza building on April 24, 2013, which with its 1133 fatalities and 2438 injuries is seen as one of the worst industrial accidents in history. Do markets reactive negatively enough to such events to motivate firms to shift their sourcing strategy? We analyze the stock market reaction to the Rana Plaza disaster in the Bangladeshi ready-made garment industry to address this question. Our analysis is based on a sample of 39 publicly traded global apparel retailers with significant garment sourcing in Bangladesh. Stock market reaction to retailers on the day of the Rana Plaza disaster is negative, but its magnitude and significance dissipate by the following day. We find no evidence of significant stock market reaction during the 11 trading days (approximately two weeks in calendar time) following the disaster. Retailers responded to the disaster by developing two different agreements to improve factory and worker safety in Bangladesh – the Accord on Fire and Building Safety in Bangladesh (AFBSB), and the Alliance for Bangladesh Worker Safety (ABWS). We find no evidence of significant stock market reaction to the announcements of the AFBSB and the ABWS. The insignificant negative economic impact from the Rana Plaza disaster suggests that retailers have little economic incentive to move sourcing out of Bangladesh or other low-cost countries so as to reduce the risk of being involved in such events. We discuss the implications of our results for retailers, non-governmental organizations (NGOs), garment factory owners in Bangladesh, the Bangladeshi government, and academic researchers.     

光助Fenton法处理罗丹明B废水的研究

为了研究卤灯-Fenton体系中各主要因素对染料废水脱色效果的影响,以罗丹明B脱色率为指标考察了反应体系p H值、Fe2+投加量、H2O2投加量3个重要参数对该体系构成的光助Fenton反应处理罗丹明B废水的影响。结果发现,卤灯作为光源可以显著提高Fenton反应降解罗丹明B的脱色效率;反应动力学过程符合一级反应动力学方程;反应体系p H值、Fe2+投加量、H2O2投加量均存在一个最佳值。在罗丹明B初始浓度为50 mg/L、p H=4、Fe2+投加量为0.2 mmol/L、H2O2投加量为4 mmol/L时,反应90 min,罗丹明B脱色效率达到100%,一级反应速率常数为0.052 2 min-1。     

Estimating the market value of Steve Jobs using an event study

Using an event study approach, we seek to estimate the value investors placed on Steve Jobs by investigating the stock market reactions to his death. In the three-day window surrounding his death, the estimated cumulative abnormal returns are ?5.76%. Given the market capitalization of Apple at the time, it can be inferred that investors valued Steve Jobs at 20 billion dollars. While tragic, the news about Jobs’ death is greeted favourably by Apple’s competitors. The competitors appear to be convinced that, without Steve Jobs, they can compete with Apple better.     

Large capital infusions,investor reactions,and the return and risk-performance of financial institutions over the business cycle

We examine investors’ reactions to announcements of large capital infusions by U.S. financial institutions (FIs) from 2000 to 2009. These infusions include private market infusions (seasoned equity offerings (SEOs)) as well as injections of government capital under the Troubled Asset Relief Program (TARP). The sample period covers both business cycle expansions and contractions, and the recent financial crisis. We present evidence on the factors affecting FIs’ decisions to raise capital, the determinants of investor reactions, and post-infusion risk-taking of the recipients, as well as a sample of matching FIs. Investors reacted negatively to the news of private market SEOs by FIs, both in the immediate term (e.g., the two days surrounding the announcement) and over the subsequent year, but positively to TARP injections. Reactions differed depending on the characteristics of the FIs, and the stage of the business cycle. Smaller, more financially constrained non-bank institutions were more likely to have raised capital through private market offerings during the period prior to TARP, and firms receiving a TARP injection tended to be riskier and more levered. In the case of TARP recipients, they appeared to finance an increase in credit risk with more stable financing sources such as core deposits, which lowered their liquidity risk. However, we find no evidence that banks’ capital adequacy increased after the capital injections.