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.     

股票市场投资者结构国际比较研究

本文梳理了A股市场与相关国家(地区)股市投资者结构的现状,探讨这些市场投资者结构的演变路径、以及促成这种演变的主要因素。基于境外主要市场投资者结构演变及政策措施的经验教训,本文提出改进A股市场相关制度的六点政策建议:第一,从更宏观的政策层面入手,改进上市公司结构,增厚上市公司利润,以增进A股市场的长期投资价值;第二,着力培育和鼓励大体量资金机构进入股市;第三,有必要继续扩大海外合格机构投资者资金规模;第四,完善金融产品供应,适当放宽交易规则约束,使机构投资者有更多工具和交易方式参与市场交易;第五,在个人投资者方面,监管部门需要适度转变监管理念,进而改进相关交易规则,鼓励个人投资者以合理方式理性参与股市;第六,创新税收激励机制,合理引导个人投资者。     

投资者情绪对股价联动的影响--基于中国证券市场的实证研究

分别从个股层面以及市场层面探讨投资者情绪对中国证券市场股价联动现象的影响。实证揭示：（1）中国证券市场存在显著的股价联动效应。（2）投资者情绪对股价联动现象存在显著的负向影响。（3）个股层面的投资者情绪变量对股价联动的影响大于市场层面的综合情绪变量。（4）投资者情绪对不同行业的股价联动的影响存在差异。     

The Impact of Oil Price Shocks on the Returns in China’s Stock Market

The main goal of this paper is to study the relationship between oil price shocks and mainland China’s stock market. From empirical study, we have found that the impact of oil price shocks on stock prices in China has been mixed. In contrast to the conventional wisdom that higher oil prices may cause lower stock prices, positive shocks to oil-market-specific demand resulted in both higher real oil prices and higher stock prices, which helps explain the boom of the Chinese stock market as oil prices were increasing in 2007. However, global oil demand and supply shocks had no significant effects.     

Investor Familiarity and Home Bias: Japanese Evidence

We examine how foreign and domestic portfolio investors, both classified into money managers, invest in Japanese firms over the sample period of 1985–1998. We propose the agency-familiarity hypothesis to explain investment behavior of these institutional investors focusing on the two firm-level variables: market capitalization and export ratios. Both types of institutional investors over-invest in familiar firms measured in firm size while each shows opposite preference patterns with respect to the export ratios. The foreign investors become more export-firm oriented in the second-half sample and the domestic orientation of the domestic institutional investors becomes statistically significant during the same second-half. Because of the location difference of their client investors, the compositions of familiar firms are different between these two types with respect to the firm’s export activities. Home bias at the firm level in terms of the sensitivity to the export ratio is evident for both types of investors, especially, in more recent years, although equity home bias at the country level has been gradually mitigated. Based on these macro- and micro-level results, we conclude that the investment behavior of money managers is more consistent with the agency-familiarity explanation than the information-based explanation regardless of their nationalities.     

Does the Momentum Strategy Work Universally? Evidence from the Japanese Stock Market

This paper investigates effectiveness of momentum strategies in the Japanese stock market during the period of 1975 to 1997. The main findings of this research are that momentum strategy portfolios which invest in past three-to-twelve month winners and sell past three-to-twelve month losers lose about 0.5% per month over the subsequent three to twelve months. This means that stock prices in the Japanese stock market reverse rather than continue over a medium-term horizon. The most significant reversal pattern is observed at the first month of portfolio formation and is unique to small stocks. Even with the market risk and size factor controlled, the price reversal is still present.     

股票价格波动对银行稳定影响的理论及经验分析

商业银行直接或间接地参与股票市场，就会因股票价格的波动影响银行资产质量进而影响银行资产负债表和银行稳定。理论和实践证明股票价格的急剧波动和银行部门不稳定性扩散之间存在紧密的联系；同时，银行信贷的扩张对股票价格的波动有很大影响。对我国的经验分析表明：银行间信贷市场与股票市场的资金连通存在较强的相关性；上市银行脆弱度与上证综合指数的相关性在5％水平上显著。在综合经营的大背景下，应加强对我国金融脆弱性的识别和监管，疏通货币市场与股票市场正常的资金联系，加强对商业银行的审慎管理，银行自身也要加强风险管理。     

Primacy in stock market participation: the effect of initial returns on market re-entry decisions

We examine whether initial returns influence investors’ decisions to return to the stock market following withdrawal. Using a survival analysis technique to estimate Finnish retail investors’ likelihood of stock market re-entry reveals that investors who experience lower initial returns are less likely to return, even after controlling for returns in the last month and average monthly returns for the duration of investing. This primacy effect is robust to accounting for endogeneity in investors’ exit decisions, and other behavioural biases such as recency and saliency of investment experience. Individual investors appear to be subject to primacy bias and tend to put a significant weight on initial experiences in re-entry decisions.     

股票价格波动对银行稳定影响的理论及经验分析

商业银行直接或间接地参与股票市场,就会因股票价格的波动影响银行资产质量进而影响银行资产负债表和银行稳定。理论和实践证明股票价格的急剧波动和银行部门不稳定性扩散之间存在紧密的联系;同时,银行信贷的扩张对股票价格的波动有很大影响。对我国的经验分析表明:银行间信贷市场与股票市场的资金连通存在较强的相关性;上市银行脆弱度与上证综合指数的相关性在5%水平上显著。在综合经营的大背景下,应加强对我国金融脆弱性的识别和监管,疏通货币市场与股票市场正常的资金联系,加强对商业银行的审慎管理,银行自身也要加强风险管理。     

投资者情绪与中国股票市场过度波动

本文分析中国投资者分类情绪及信心变化与中国股票市场波动的同期及动态影响。实证结果表明:就同期而言,中国投资者对国内经济基本面的信心变化以及中国股票市场波动,将影响投资者对国际经济金融环境的信心;就中长期而言,中国投资者情绪中关于国内经济基本面和国内经济政策的信心变化是影响中国股票市场过度波动的重要原因;中国投资者关于国际经济金融环境的信心深受国内经济基本面的信心变化的影响,中国投资者对A股市场估值的判断,受投资者对A股市场的股票估值信心以及国内经济基本面信心变化影响较大。     

水信息披露、机构投资者与股价同步性

基于2010-2016年中国A股高水敏感行业的322家上市公司数据,实证检验水信息披露对股价同步性的影响,以及机构投资者的调节效应。研究表明：水信息披露对股价同步性的影响呈倒U型,且在民营企业样本中尤其显著。在国有企业样本中,机构投资者的加入能促使水信息披露更好地融入股价;在民营企业样本中,只有在高水信息披露水平下,机构投资者才能更好地发挥调节作用。     

石油价格与股票市场的溢出效应——基于中美数据的比较分析

本文以中美股票市场和国际原油市场的数据为样本,用VAR模型和二元GARCH模型研究了中美股市价格和国际石油价格的收益率及波动的溢出效应。研究结果表明,中国股市价格和国际石油价格之间,既不存在任何方向的收益率溢出效应,也不存在任何方向的波动溢出效应;而国际石油价格的变化率对于美国股市收益率确有负向先导作用,并且两者之间具有双向的波动溢出。     

Positive Feedback Trading and Investor Sentiment

This article examines how investor sentiment affects positive feedback trading behavior. By analyzing the daily closing total return of CSI 300 index and its individual returns of stocks, we find that relatively high or low sentiment induces active positive feedback trading. With a specific indicator of sentiment, we explain the microstructure setting of the relationship between positive feedback trading and sentiment. We adopt the classical feedback model from Sentana and Wadhwani (1992) to measure positive feedback trading behavior. By adding sentiment factor to the model, we successfully explain how sentiment influences the behavior of both feedback traders and rational investors. The empirical findings suggest that positive feedback traders are more likely to trade when the prices of most securities move forward together. When the sentiment of feedback traders is at an intermediate level, the feedback trading behavior is insignificant.     

Investor Trading Behavior and Sentiment in Futures Markets

This study investigates the effects of investor trading behavior and investor sentiment on futures market return. We find that the spot investor trading behavior, futures investor trading behavior, spot market sentiment, and futures market sentiment all have positive effects on daily futures returns in Chinese financial market. More importantly, we show that the effect of (spot) futures investor trading behavior has better explanatory power than (spot) futures market sentiment on futures returns. Further supporting our results, high investor trading behavior and high investor sentiment strengthen the positive relation between sentiment-returns and behavior-returns.