我国汇市与股市之间的价格和波动溢出效应实证研究

为了考察我国汇市与股市之间的价格和波动溢出效应,本文利用"汇改后"人民币对美元的汇率与上证综指的日数据建立了多元向量自回归模型GARCH模型.研究发现,我国汇市与股市之间的价格溢出效应不明显,汇率波动率的ARCH效应不对股票市场产生显著的冲击,外汇市场波动的持久性会对股票市场产生显著的影响;股票收益率的ARCH效应不会对外汇市场产生明显的冲击,但股票收益率波动的持久性会显著影响汇率的变化率.     

中国股市与汇市的波动溢出效应研究

以上证综合指数和人民币兑美元名义汇率为指标,运用多元GARCH模型对中国股票市场和外汇市场之间的波动溢出效应进行的实证研究表明,汇率制度改革后,我国股市与汇市存在显著的双向波动溢出效应,汇市对股市表现出较强的波动传导,而股市对汇市的波动传递相对较弱,存在着波动传导的非对称性。     

股票市场与人民币汇率的波动溢出效应——基于多元GARCH模型的实证分析

本文采用多元BEKK-GARCH模型,立足于人民币汇率波动与我国股票市场现状,利用“汇改后”美元对人民币的汇率与上证综指的日数据,实证分析了我国汇市与股市之间的波动溢出效应,并对宏观政策的制定与投资者对风险的规避提出建设性意见.     

人民币汇率与沪市之间的溢出效应研究

通过VECM模型和BEKK模型对人民币汇率与沪市之间的信息传递模式以及人民币汇率收益与沪市收益之间的均值溢出效应和波动溢出效应进行分析,发现在沪市大幅下跌前,存在单向的由汇市到沪市的均值溢出效应,在沪市大幅下跌后,存在单向的由沪市到汇市的均值溢出效应。而沪市大幅下跌前后汇市和沪市间则均存在着双向的波动溢出效应,但汇市对沪市的波动溢出远大于沪市对汇市的波动溢出。     

中国汇市与股市的信息传递关系——基于股市"牛熊"特征的比较研究

关注金融市场间的风险传染性对于防范金融风险、提高监管效率有着重要的意义.运用多元GARCH模型研究汇改后(2005年7月22日到2009年8月31日)中国股票市场与外汇市场的信息传导过程,其结果表明汇市的波动风险会传染给股市,而股市的波动则不会对汇市产生明显影响,股市与汇市之间的溢出效应是非对称的.分阶段研究显示,在牛市阶段,股市对汇市存在微弱的信息溢出效应;熊市阶段,只存在单向溢出效应,随着时间的推移,汇市对股市的溢出效应逐渐增强.     

股票市场与外汇市场之间的溢出效应:基于汇改后数据的实证分析

本文采用双变量EGARCH模型,实证分析了我国汇改后股市与汇市之间价格和波动的溢出效应,同时还以2008年10月为界将样本分为两个子样本来考察溢出效应是否发生结构变化.研究发现:(1)从整个样本看,存在从汇率变化到股指收益的价格溢出效应,在子样本1中存在从股市到汇市的价格溢出效应;(2)在子样本中存在从汇市到股市的波动溢出,在整体样本及两个子样本中都存在从股市到汇市的波动溢出.本文还分析了实证结果背后的原因,并讨论了相应的政策启示.     

人民币汇率与中国股市溢出效应研究——基于VAR-GARCH-BEKK扩展模型

2014年3月汇改以来,人民币汇率和国内股票市场联动性明显增强。基于VAR-GARCHBEKK扩展模型实证研究了2014年3月18日到2016年1月15日期间人民币汇率和股指收益率间的关系。研究结果表明,汇率对股市不仅存在显著的均值溢出效应——即前期汇率的贬值会给股市带来收益率均值下行的压力,而且还存在汇率向股市的单向波动溢出效应。     

基于变结构Copula模型的股市与汇市间波动溢出效应研究

本文采用变结构Copula模型对我国股、汇市间的波动溢出效应进行研究。利用二元正态Copula函数的时变相关系数得出美元对人民币汇率与沪深300指数间相关关系的变结构点,再利用混合Copula模型分段检验波动溢出效应。实证结果表明,汇改以来,美元对人民币汇率与沪深300指数间存在着长期而显著的波动溢出效应。在次贷危机发生期间,美元对人民币汇率与沪深300指数间相关关系的变结构点增多,尾部相关性增强,两市间的波动溢出效应显著增强。因此,应加强对波动溢出传导中介的管理,减轻波动溢出效应的负面影响。     

股票市场与外汇市场收益率波动溢出效应研究——基于多元BEKK-GARCH模型

用多元BEKK-GARCH模型检验了股票市场与外汇市场收益率的波动溢出效应,结合LR似然比检验和Wald检验,实证研究股票市场和外汇市场收益率的波动关系。研究表明:股票市场与外汇市场收益率序列都存在ARCH效应和GARCH效应,即都具有时变方差特征;且两市的波动具有较高的持续性。股票市场和外汇市场收益率存在单向的,不对称的溢出效应,即汇市对股市有波动溢出效应,反之则不然。     

国际金融危机前后国内股市与汇市波动溢出效应比较研究——基于上证商业、地产、工业、公用及综合指数的实证分析

本文基于BVGARCH-BEKK模型对比分析国际金融危机前后国内股市与汇市之间的波动溢出效应,揭示金融市场联动特征和金融危机对其内在影响.实证发现:金融危机爆发后国内汇市的波动风险会显著地传导到股市,而股市的波动不会对汇市产生明显的影响.危机前后地产、工业板块与汇市的互动关系同总体股市与汇市的互动关系趋同,而危机爆发后汇市对商业、公用板块的传递效应消失.最后,本文对实证结果作了原因分析并提出结论.     

Debt and Taxes and Uncertainty

With a graduated personal tax schedule, Miller showed that there could be an equilibrium debt supply for the corporate sector as a whole. In the presence of uncertainty there is also a unique debt/equity ratio for each individual firm, and this ratio is related to the firm's operational risk characteristics. However, if firms merge and spin off in response to tax incentives, the identity of firms is ambiguous and only the corporate sector is a meaningful construct. These arguments are developed in both discrete and continuous models that employ extensions of the arbitrage-free pricing theory.     

教育与资本怎样的前景怎样的现实

来自政府的声音: "动员各种社会资源,发展教育" 此次论坛上财政部长助理张少春的发言是最受关注的发言之一.他的演讲传达出的信息有这样几方面:第一,谈到现实,他认为全社会对教育的巨大需求与我国公共投入不足已成为我国教育事业发展的突出矛盾.近年来,以公共部门投入为主,多渠道筹措教育经费的教育投入机制成为解决这一问题的重要途径,也使得公共部门与私营部门在教育领域的合作日益密切.第二,谈到前景,他认为,1.中国经济持续、快速的增长对高技能人才产生巨大的需求,这为私营部门的参与提供了广阔空间.2.随着公共财政职能的不断完善,财政资金将在各项教育事业中重新进行分配,进一步优化财政支出结构,提高资金的使用效率.在"十一五"期间,我国将把公共支出的重点转移到农村.我们将逐步把全体农村适龄儿童的义务教育全部纳入公共财政体制.     

East and west and north and south : A preliminary model

The Brandt report and other proposals for a new North-South world order continue to be the focus of lively debate, yet it is often argued that little concrete has emerged from their recommendations. A major reason for this, the author argues, is that the East-West conflict component is not sufficiently taken into consideration-East-West tensions are a severe constraint on and a determining factor of North-South relations. Using influence diagrams, the author develops a flexible framework for discussion and assessment of N/S-E/W relations.     

Director gender and mergers and acquisitions

Does director gender influence CEO empire building? Does it affect the bid premium paid for target firms? Less overconfident female directors less overestimate merger gains. As a result, firms with female directors are less likely to make acquisitions and if they do, pay lower bid premia. Using acquisition bids by S&P 1500 companies during 1997–2009 we find that each additional female director is associated with 7.6% fewer bids, and each additional female director on a bidder board reduces the bid premium paid by 15.4%. Our findings support the notion that female directors help create shareholder value through their influence on acquisition decisions. We also discuss other possible interpretations of our findings.     

Political corruption and mergers and acquisitions

This research examines the relation between political corruption and mergers and acquisitions (M&As). We find that local corruption increases firm acquisitiveness but decreases firm targetiveness. The levels of corruption in acquirer areas relate positively to the bid premiums and negatively to the likelihood of deal completion. Corruption motivates acquiring firms to use excess cash for payment, which mitigates the negative effect of corruption on acquirer shareholder value. The evidence indicates that acquisitions help acquiring firms convert cash into hard-to-extract assets and relocate assets from the high to low corruption areas, thereby shielding their liquid assets from expropriation by local officials.     

Trust and cross-border mergers and acquisitions

A number of studies suggest that social trust matters for investment. Using different measures of trust from World Values Survey, we show that countries where people display higher levels of trust engage in more cross-border M&A activities. When they do, these acquirers pay lower premiums. To the extent that these acquirers also tend to engage in larger acquisitions as well, our findings suggest that a larger selection pool of potential targets and higher value targets enable these acquirers to negotiate for lower premiums. We do not find evidence of the significant effect for target country trust levels. Hence, trust may benefit those acquiring firms in cross-border transactions.     

Tournament-based incentives and mergers and acquisitions

This research examines the relation between tournament-based incentives, which are proxied by the difference between a firm's CEO pay and the median pay of the senior managers, and mergers and acquisitions (M&As). We find that tournament-based incentives are positively related to firm acquisitiveness and acquiring firms' stock and operating performance. Further analysis indicates that positive acquisition performance increases the likelihood of the CEO being promoted from inside the acquiring firm. Our evidence is consistent with the view that tournament-based incentives motivate acquiring firms' managers to make greater efforts and take more risk that result in superior acquisition performance.     

Corporate Innovations and Mergers and Acquisitions

Using a large and unique patent‐merger data set over the period 1984 to 2006, we show that companies with large patent portfolios and low R&D expenses are acquirers, while companies with high R&D expenses and slow growth in patent output are targets. Further, technological overlap between firm pairs has a positive effect on transaction incidence, and this effect is reduced for firm pairs that overlap in product markets. We also show that acquirers with prior technological linkage to their target firms produce more patents afterwards. We conclude that synergies obtained from combining innovation capabilities are important drivers of acquisitions.