我国货币政策与股票市场的相依性研究

对VAR同时施加短期约束与长期约束,以识别价格型货币政策与股票价格之间的同步冲击响应关系。结果表明,股票价格对利率的即刻冲击响应为负,长期冲击响应收敛于零,这解决了乔斯基分解的长期正向效应之谜。股票价格对利率具有即刻正向冲击,且这种冲击不具有长记忆性。产出和通货膨胀对股票价格的冲击均具有正向滞后响应。实证结果可为基准利率的确定、货币政策的制定执行、股票市场的稳定发展、宏观调控的有效实施、货币政策由数量型向价格型的过渡提供一定的经验支持。     

银行信贷与股票价格关系研究--基于后金融危机时代数据的再检验

本文以08年次贷危机以后的变量月度数据为基础,综合运用向量自回归模型以及误差修正模型来研究后金融危机时代我国银行信贷与股票价格之间的关系,实证结果表明,在金融危机后的中国,银行信贷与股票价格的关系在短期内存在一定的正向关系,但在长期内存在负向关系。通过格兰杰因果检验发现,股票市场的变化是信贷市场波动的格兰杰原因,而反之不成立。     

股票价格具有货币政策指示器功能吗——来自中国1997～2006年的经验证据

本文运用VAR模型考察了以股票价格为代表的金融资产价格对我国通货膨胀的影响。实证分析表明,我国股票价格的变动对产出缺口存在一定的正向影响,但是这种影响不太稳定,说明我国股票价格通过总需求渠道对未来通货膨胀产生的影响比较微弱。同时,我国股票价格的变动能引起未来CPI和WPI的同向变化,尤其与CPI的关系非常稳定,说明股票价格在一定程度上包含了我国未来通货膨胀的信息。因此,我国股票价格可以作为一个帮助判断未来经济走势和通货膨胀变动趋势的货币政策指示器。     

媒体关注度对新股表现的影响——来自中国股票市场的证据

新闻媒体对证券投资的影响日趋重要,它会通过影响投资者的心理和行为而影响资产价格。首次公开发行的股票（IPOs）由于倍受媒体关注,从而会在上市以后的价格表现上产生一定的影响。本文选取2006年6月至2008年6月上市的246只首次公开发行的股票作为样本,以百度新闻搜索到包含股票名称的新闻数量作为媒体关注度的衡量指标,实证检验了媒体关注度对新股表现的影响。本文得出结论：媒体关注度通过影响投资者情绪,对新股短期累积超额收益产生正的影响,而对长期累积超额收益产生负的影响。同时发现,媒体关注度高的新股,其发行价格也相对较高。     

基于噪声交易模型的区域房地产价格波动的实证分析——以安徽省宿州市为例

本文运用行为金融学的噪声交易理论解释目前区域性房地产市场交易中的非理性行为。通过引入噪声交易模型（DSSW模型）,运用邹检验对区域房地产市场运行情况进行了分时段的实证检验,利用协整检验和格兰杰因果检验,证明整个样本期（2005年1月一2011年6月）信贷投放并不会必然导致房地产价格上涨,但是具有正向冲击和抬升作用;发现噪声交易者的非理性行为会导致区域房地产价格的剧烈波动和单方面的持续上涨,进而从理论上证明了信贷投放和房地产市场主体的行为会对区域房地产价格波动产生影响。最后对实证结果进行了原因分析并给出了政策建议。     

通货膨胀对资产价格波动影响的实证分析

通过针对通货膨胀对资产价格波动影响的分析来验证实现价格稳定与经济健康发展的关系,在对资产价格波动与通货膨胀关系的理论假说的基础上来进行CPI与上证综指相关关系的实证分析,建立VAR模型,同时完成格兰杰因果检验,得出资产价格波动与通货膨胀呈现出越来越强的同步性。得出当通货膨胀有较大变化时,应关注股市资金、参与人数和人们配置股票资产的变化导致股票价格上涨而股市中价格系统恰好有交换和传递信息的功能结论,说明股票市场中股票价格变化可以作为央行制定货币政策的参考变量。     

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。     

基于VAR模型的我国股市量价关系研究

基于2004年2月-2020年11月上证综合指数和交易量,笔者运用ADF单位根检验、Johansen协整检验、VA R模型以及方差分解等方法,发现股票交易量不是价格的格兰杰原因,而股票价格是交易量的格兰杰原因,但价格对交易量的影响效力处于2％～4％的较低水平,并据此提出提高投资者的金融素养、建立健全信息披露机制、提高政府宏观调控能力与水平、深化金融市场的市场化建设、金融科技助力证券市场新兴发展等建议.     

通货膨胀对资产价格波动影响的实证分析

通过针对通货膨胀对资产价格波动影响的分析来验证实现价格稳定与经济健康发展的关系,在对资产价格波动与通货膨胀关系的理论假说的基础上来进行CPI与上证综指相关关系的实证分析,建立VAR模型,同时完成格兰杰因果检验,得出资产价格波动与通货膨胀呈现出越来越强的同步性.得出当通货膨胀有较大变化时,应关注股市资金、参与人数和人们配置股票资产的变化导致股票价格上涨而股市中价格系统恰好有交换和传递信息的功能结论,说明股票市场中股票价格变化可以作为央行制定货币政策的参考变量.     

我国燃料油期货价格与消费企业股票价格相关性研究

期货价格和股票价格之间的动态关系能够反映期货市场的价格发现能力和运行效率。本文选取上海燃料油期货和燃料油主要消费行业的龙头公司鲁西化工、深南电、深远航运这三家股票价格以及燃料油现货、上证综合指数的日数据为样本,应用Johansen协整检验、向量误差修正模型、方差分解等方法探讨燃料油期货价格与相关消费企业股票价格间的互动关系。研究表明:我国燃料油期货市场和燃料油消费行业股票市场之间存在长期均衡关系,当期货和现货价格偏离长期均衡时,股价能够通过反向修复机制进行修正;燃料油消费行业股票价格主要受自身水平影响,期货价格对股票价格的影响非常有限;燃料油期货市场和燃料油消费行业股票市场具有较强的独立性。     

投资者关注与股价崩盘风险:抑制还是加剧?

本文以2010—2017年中国A股上市公司为样本,考察了投资者关注影响股价崩盘风险的客观表现和传导路径。研究发现,投资者关注度的提高会显著加剧下一期的股价崩盘风险,存在“关注度的崩盘效应”;分组检验发现,关注度的崩盘效应仅在机构持股比例低的公司和市场处于牛市状态下存在;路径检验发现,投资者关注不存在信息路径,没有改善公司信息透明度,但存在部分的情绪路径,提高了股价同步性和投资者情绪,从而加剧了股价崩盘风险。建议监管部门重视投资者关注对股价带来的冲击,通过进一步提高机构者持股比例,缓解情绪过热导致的定价错误程度,降低股价崩盘风险。     

Option prices and stock market momentum: evidence from China

Option prices tend to be correlated to past stock market returns due to market imperfections. We unprecedentedly examine this issue on the SSE 50 ETF option in the Chinese derivatives market. To measure the price pressure in the options market, we construct an implied volatility spread based on pairs of the SSE 50 ETF option with identical expiration dates and strike prices. By regressing the implied volatility spread on past stock returns, we find that past stock returns exert a strong influence on the pricing of index options. Specifically, we find that SSE 50 ETF calls are significantly overvalued relative to SSE 50 ETF puts after stock price increases and the reverse is also true after the stock price decreases. Moreover, we validate the momentum effects in the underlying stock market to be responsible for the price pressure. These findings are both economically and statistically significant and have important implications.     

Social media information dissemination and corporate bad news hoarding

This paper investigates the role of social media in mitigating corporate bad news hoarding from a stock price crash risk perspective. Using a sample of public listed firms from 2008–2019, we find that social media (Guba) posts could significantly reduce firms’ stock price crash risks in the Chinese stock market. Furthermore, we find that the information intermediation function and complementary corporate governance function enable Guba to achieve such an effect. In addition, investor attention mediates the relationship between Guba posts and management withholding bad news. Our result still holds after a series of robustness checks, including an RDD approach.     

Stock price synchronicity and analyst coverage in emerging markets

This paper examines the relation between the stock price synchronicity and analyst activity in emerging markets. Contrary to the conventional wisdom that security analysts specialize in the production of firm-specific information, we find that securities which are covered by more analysts incorporate greater (lesser) market-wide (firm-specific) information. Using the R² statistics of the market model as a measure of synchronicity of stock price movement, we find that greater analyst coverage increases stock price synchronicity. Furthermore, after controlling for the influence of firm size on the lead–lag relation, we find that the returns of high analyst-following portfolio lead returns of low analyst-following portfolio more than vice versa. We also find that the aggregate change in the earnings forecasts in a high analyst-following portfolio affects the aggregate returns of the portfolio itself as well as those of the low analyst-following portfolio, whereas the aggregate change in the earnings forecasts of the low analyst-following portfolio have no predictive ability. Finally, when the forecast dispersion is high, the effect of analyst coverage on stock price synchronicity is reduced.     

The COVID-19 pandemic: How important is face-to-face interaction for information dissemination?

Does face-to-face interaction still facilitate information transfer despite proliferating communication technologies? We use the COVID-19 collapse in such interactions to examine their influence on information flow in the stock market around earnings announcements. Using daily, county-level abnormal mobility of U.S. residents to proxy for face-to-face interaction, we find that firms located in counties with lower abnormal mobility experience a weaker immediate price reaction to earnings announcements and a larger post-announcement drift. Our findings suggest that lower face-to-face interactions dampen price discovery in financial markets, and that investor attention is a potential mechanism of this effect.     

The impact of nominal stock price on ex-dividend price responses

In this paper, we examine whether nominal stock price can help to explain the ex-dividend day anomaly where stock prices drop by less than the dividend amount on the ex-dividend date. We find that stocks with lower nominal prices have ex-dividend day price drops that are more consistent with theoretical predictions based on an efficient market. After controlling for factors that have been previously documented to influence ex-dividend day stock price behavior, price-drop-to-dividend ratios are closer to one for lower priced stocks. To further explore this phenomenon, we examine the change in the price-drop-to-dividend ratio around stock splits. Firms that split their shares have a larger price-drop-to-dividend ratio after the split, and companies that reverse split their shares have a smaller price-drop-to-dividend ratio after the split. Our evidence indicates that ex-dividend day stock price behavior is influenced by the nominal price of a share and that this relation could also influence the decision to split a firm’s shares.     

Chief financial officer overconfidence and stock price crash risk

Numerous studies have shown the prevalence of overconfidence among Chief Financial Officers (CFOs). Surprisingly, the real effect of CFO overconfidence is under-researched. Using data from a large sample of US-listed firms over the period 1993–2019 and adopting an eclectic theoretical approach, we find that overconfident CFOs are more likely to increase stock price crash risk than non-overconfident CFOs through risk-taking and bad news hoarding. These findings pass a series of robustness tests. Furthermore, departing from most overconfident studies that merely examine one type of top managers (i.e., Chief Executive Officer (CEO)), we consider the influence of CEO and CFO overconfidence jointly. Interestingly, we find that CFO overconfidence outweighs CEO overconfidence in influencing stock price crash risk. Moreover, the overconfidence effect is intensified when overconfident CFOs collaborate with overconfident CEOs, thus raising stock price crash risk. However, stronger governance and a transparent information environment constrain overconfident CFOs' effect on stock price crash risk. Overall, our findings highlight the importance of CFO overconfidence in determining stock return tail risks.     

Underwater Options and the Dynamics of Executive Pay-to-Performance Sensitivities

We empirically analyze the dynamics of executives' pay‐to‐performance sensitivities. Option pay‐to‐performance sensitivities become weaker as options fall underwater, often leading to pressures to reprice options or restore pay‐to‐performance sensitivity in other ways. Building a detailed data set on executives' portfolios of stock and options, we find that the responsiveness of pay‐to‐performance sensitivities (created by all executive holdings of stock and options) to changes in stock price is large. The elasticity of pay‐to‐performance sensitivities with respect to stock price decreases is about 0.7 and is larger for high‐option executives and for executives with high percentages of options already underwater. The dominant mechanism through which companies offset declines in option pay‐to‐performance sensitivities is larger option grants following stock price declines; on average, these larger grants restore approximately 40% of the stock‐price‐induced pay‐to‐performance sensitivity declines. Option repricings are inconsequential in this regard, despite the attention they have attracted. In looking at positive returns, we find the reverse: higher returns both directly increase pay‐to‐performance sensitivities and lead to larger option grants, which raise pay‐to‐performance sensitivities further. Thus, option grants to executives tend to be largest following large stock price increases or large stock price decreases.     

Firms’ histories and their capital structures

This paper examines how cash flows, investment expenditures, and stock price histories affect debt ratios. Consistent with earlier work, we find that these variables have a substantial influence on changes in capital structure. Specifically, stock price changes and financial deficits (i.e., the amount of external capital raised) have strong influences on capital structure changes, but in contrast to previous conclusions, we find that over long horizons their effects are partially reversed. These results indicate that although firms’ histories strongly influence their capital structures, over time their capital structures tend to move towards target debt ratios that are consistent with the tradeoff theories of capital structure.     

The influence of ownership structure,analyst following and institutional infrastructure on stock price informativeness: international evidence

Using firms from 20 non‐US countries, we investigate whether and how ownership structure, analyst following and country‐level institutions influence stock price informativeness (SPI). We find that stock price informativeness decreases with control‐ownership wedge (the detachment of voting rights from cash flows rights), and this SPI‐reducing effect of the wedge is attenuated for firms with high analyst following and in countries with strong country‐level institutions. We also find that stock price informativeness decreases with analyst following, but this SPI‐reducing effect of analyst following is attenuated in countries with strong country‐level institutions.