Firm Characteristics and Stock Price

This study examines the stock price reaction to the internal control reporting required under Section 404 of the Sarbanes‐Oxley Act of 2002 for three distinct groups of firms. After controlling for general stock price movements, we find that stock returns are most negative for firms that delay filing of their internal control reports, continue to be negative for firms with ineffective internal controls, and are positive for firms with effective internal controls. The decrease in stock prices of the first two groups is more pronounced for those with a lower return on assets, higher growth rate in sales, and no prior disclosure of their internal controls weaknesses. Our results indicate that market participants value the reliability of financial information ensuing from Section 404 compliance, irrespective of firm size and debt proportion. Thus, regulators and policymakers worldwide should consider mandating comparable SOX 404 compliance for all publicly held companies to improve the accuracy and reliability of financial reports.     

Firm Size and Cyclical Variations in Stock Returns

Recent imperfect capital market theories predict the presence of asymmetries in the variation of small and large firms' risk over the economic cycle. Small firms with little collateral should be more strongly affected by tighter credit market conditions in a recession state than large, better collateralized ones. This paper adopts a flexible econometric model to analyze these mplications empirically. Consistent with theory, small firms display the highest degree of asymmetry in their risk across recession and expansion states, which translates into a higher sensitivity of their expected stock returns with respect to variables that measure credit market conditions.     

Equity Issues and Stock Price Dynamics

This paper presents an information-theoretic, infinite horizon model of the equity issue decision. The model predicts that (a) equity issues on average are preceded by an abnormal positive return on the stock, although for some firms the issue is preceded by a loss; (b) equity issues on average are preceded by an abnormal rise in the market; and (c) the stock price drops at the announcement of an issue. The model provides a measure of the welfare cost of asymmetric information; the welfare loss may be small even if the price drop at issue announcement is large.     

An Empirical Study of Firm Size and Competitiveness in German Life Insurance

Based on a purely rank-oriented approach, this empirical study analyzes to what extent superior firm size in German life industry generally translates into corporate advantages for the companies concerned. It turns out that while modest advantages with some criteria are measurable, any such benefits are usually outweighed by unquantifiable factors unrelated to firm size. Confining the study to a highly homogeneous subgroup of life insurers, however, reveals substantial corporate advantages in a number of areas, thereby confirming well-established theoretical reasoning.     

融资约束、企业规模与成长动态

利用2001～2010年中国制造业上市公司数据,采用面板数据VAR模型分析融资约束、企业规模与成长动态之间的关系。实证分析表明:削减融资约束可以推动企业的规模扩张与企业的成长,同时企业自身的成长可以降低企业的融资约束、促使企业规模扩大;而企业规模扩张会带来企业成长率的下降,初期受到融资约束较大而后会减缓企业的融资约束。这一研究可以为发展金融市场,削减融资约束、促进企业成长进而为推动中国经济增长提供经验证据。     

Cash Flow News and Stock Price Dynamics

We develop a new approach to modeling dynamics in cash flows extracted from daily firm-level dividend announcements. We decompose daily cash flow news into a persistent component, jumps, and temporary shocks. Empirically, we find that the persistent cash flow component is a highly significant predictor of future growth in dividends and consumption. Using a log-linearized present value model, we show that news about the persistent dividend growth component predicts stock returns consistent with asset pricing constraints implied by this model. News about the daily dividend growth process also helps explain concurrent return volatility and the probability of jumps in stock returns.     

股价波动与通货膨胀关系的实证研究

本文运用格兰杰因果关系检验、脉冲响应函数和方差分解等计量方法,得出以下主要结论：股票价格是影响通货膨胀和通胀预期的重要变量;股票价格是通货膨胀、通胀预期的格兰杰原因,反向因果关系不明显;股票价格的上升,在相当短的时期内,即1—2个季度内,与通货膨胀率和通胀预期负相关,然后从第2—3季度开始,股票价格与通货膨胀率和通胀预期正相关,第9季度开始,股票价格与通货膨胀率和通胀预期负相关。利用财富效应和替代效应假说,本文认为当财富效应大于替代效应时,股价与通货膨胀正相关;当财富效应小于替代效应时,股价与通货膨胀负相关。最后,提出了政策建议。     

中国货币供应量与股票市场价格关系的实证分析

股票市场作为货币政策传导的渠道,一方面通过货币供应量影响股票市场价格,另一方面股票市场价格的变动反馈到投资、消费等领域,从而影响宏观经济以实现货币政策的目标。本文对我国货币供应量与股票市场价格关系进行了实证检验,分析检验结果后认为我国各层次的货币供应量与股票市场价格存在长期的协整关系,其中股票市场价格处于因方地位,货币供应量处于果方地位。本文的实证结论在一定程度上反映了目前我国股票市场的货币政策传导效率不高,还没有发挥其应有的作用,这与我国股票市场自身缺陷有很大关系。     

机构投资者持股与股价同步性分析

本文利用中国证券市场所有A股上市公司2005～2007年的面板数据,对股价同步性和代表机构投资者持股的三个变量——机构投资者持股比例、机构投资者持股变化和持股机构投资者数量进行回归统计,检验了机构投资者持股对股价同步性的影响。研究表明,代表机构投资者持股的三个变量都与股票股价同步性显著负相关,其中机构投资者持股变化是影响股价同步性的决定性因素,其他两个变量都是通过该变量发生作用的。这一结果说明机构投资者利用公司特质信息进行的基于信息的交易提高了股价中的信息含量,降低了股价同步性。     

可转债转股对标的股票价格影响的实证研究

本文研究了可转债转股行为对标的股票价格的影响,这对可转债的定价具有重要的意义。通过运用事件研究法,对自2001年4月以来上市的可转债转股对标的股票价格的影响进行了实证分析,结果表明：可转债转股在初期会使其标的股票产生显著为正的超额收益,而后随着转股权的执行、股价的下跌,超额收益率显著为负,即可转债转股会对股权产生稀释效应。同时,在剔除指数波动率影响的情况下,实证研究表明可转债转股对股票波动率没有显著的影响。     

中国A股量价之间动态关系的实证研究

本文采用了VAR模型以及Granger因果检验的方法来考察量价之间的动态相关关系。我们选定1996年12月16日至2008年12月31日作为样本研究区间,实证发现滞后期的交易量和收益对当前期交易量与收益的解释力度存在下降趋势;同时,交易量同收益之间由收益对交易量的单向引导发展为双方互为Granger原因。本文得到的交易模式的动态演变轨迹反映了我国投资者式逐步趋于理性成熟。     

中国A股量价之间动态关系的实证研究

本文采用了VAR模型以及Granger因果检验的方法来考察量价之间的动态相关关系.我们选定1996年12月16日至2008年12月31日作为样本研究区间,实证发现滞后期的交易量和收益对当前期交易量与收益的解释力度存在下降趋势;同时,交易量同收益之间由收益对交易量的单向引导发展为双方互为Granger原因.本文得到的交易模式的动态演变轨迹反映了我国投资者式逐步趋于理性成熟.     

中国汇率与股票价格联动的实证研究

汇率与股票价格之间存在着联系。汇率—股票价格之间的传统机制、组合机制、短期套利机制、利率粘性机制和产出机制在中国受到不同程度的影响,但是中国汇率和股票价格之间并不是完全隔绝的。中国的汇率与股票价格联动机制以及其发生作用的方式和程度与成熟市场经济体之间有较大的差异,投机机制已经率先发挥一定的作用。     

公司透明度与股价波动同步性的相关性研究

本文选取2001-2007年在深交所上市的所有A股上市公司为研究样本,以深交所的信息披露评级指标作为公司信息透明度的度量指标,在此基础上,考察公司透明度对股价波动同步性的影响。实证结果表明,随着公司信息透明度的改善,股价同波动性不断下降,但各信用评级等级之间的股价同波动性差异并不高。本文给出了可能的分析解释,并指出了下一步深入研究的方向。     

中国股指期货“助涨助跌效应”实证研究

利用E-G两部法协整检验、向量误差修正模型、VAR模型、Granger因果性检验及脉冲响应和方差分解全面剖析了股指期货与现货市场之间的联动性。实证研究结果表明股指期货和股票指数之间存在长期的均衡关系,股票指数短期的过度偏离会导致长期非均衡误差的弱势修正,当市场受到确定性信息冲击时,股票期货市场对股票现货市场具有助涨助跌作用;当市场受到不确定信息冲击时,股票现货市场对股票期货市场具有助涨助跌作用。     

Housing Price Dispersion: An Empirical Investigation

The efficiency of a market is challenged when price dispersion occurs. Previous studies focused on non-durable consumption goods. This study extends the analysis to the case of residential property, whose transactions are dominated by a second-hand market with many potential buyers and sellers. We demonstrate that housing price dispersion exists, and the degree of dispersion changes systematically with some macroeconomic factors, though the second and the third moment of the price distribution react differently to the macroeconomic variables. Some directions for future research are suggested.     

Stock Repurchases and Excess Returns: An Empirical Examination

The excess returns associated with repurchase announcements are viewed largely as a reaction to management's statement that the firm's shares are underpriced; management's signal provides new information that enhances the firm's market value. Although earlier studies have found the excess return to be closely related to the premium set by managment, other factors play a part in determining both the market reaction and the premium level set by management. Among these factors ar relative market capitalization, holdings by institutions, immediate alternative uses for cash, level of insider control, recent stock price performance, relative size of the tender offer, and the resultant change in the firm's capital structure.     

Trading Mechanisms and Stock Returns: An Empirical Investigation

This paper examines the effects of the mechanism by which securities are traded on their price behavior. We compare the behavior of open-to-open and close-to-close returns on NYSE stocks, given the differences in execution methods applied in the opening and closing transactions. Opening returns are found to exhibit greater dispersion, greater deviations from normality and a more negative and significant autocorrelation pattern than closing returns. We study the effects of the bid-ask spread and the price-adjustment process on the estimated return variances and covariances and discuss the associated biases. We conclude that the trading mechanism has a significant effect on stock price behavior.     

国际股票市场、汇率冲击对我国股票价格影响的实证研究

随着金融一体化的发展,20世纪90年代中期以后股票市场联动的现象日益显著,我国外贸依存度不断提高、金融服务业逐步开放,2005年7月21日人民币汇率形成机制改革以来,汇率浮动区间的扩大是否起到了缓解国际市场冲击的作用成为理论界有待探讨的问题.本文分析了美国股票市场和汇率与我国股票价格之间的作用形式和程度,并对汇率是否起到缓解国际股票市场冲击的作用进行了检验.结果表明,在人民币升值的趋势下,汇率变化在股票市场面临负向冲击时,起到一定的缓冲作用;在股票市场面临正向冲击时,起到的是加速作用.