机构投资者羊群行为与股价崩盘风险
许年行;于上尧;伊志宏;
摘要(Abstract)：
机构投资者究竟是会加剧股价崩盘风险,还是起到稳定资本市场的作用,是近年来财务学研究和社会各界关注的焦点。本文以20052010年我国A股上市公司和机构投资者持股数据为研究样本,从机构投资者"羊群行为"视角考察其对公司层面股价崩盘风险的影响。研究发现:(1)机构投资者的羊群行为提高了公司股价未来崩盘的风险;(2)在区分羊群行为的不同方向后发现,上述正向关系在"卖方"羊群行为的样本中更为明显;(3)合格境外机构投资者(QFII)的存在并不能减弱机构投资者羊群行为与股价崩盘风险之间的正向关系。进一步研究发现,机构投资者羊群行为同样提高了上市公司股价同步性,并且QFII的存在会加剧机构投资者羊群行为与股价同步性之间的正向关系。这说明,在中国,机构投资者更多的是扮演"崩盘加速器",而不是"市场稳定器"。本文的研究对于理解机构投资者在我国资本市场中的作用以及如何防范股价崩盘风险、促进股市平稳发展都具有重要的理论与现实意义。
关键词(KeyWords)： 机构投资者;羊群效应;崩盘风险;股价同步性
基金项目(Foundation): 国家自然科学基金项目(批准号:71172180、70972130);; 全国博士学位论文作者专项资金资助项目(批准号:201085)对本研究的支持
作者(Authors): 许年行;于上尧;伊志宏;
DOI: 10.19744/j.cnki.11-1235/f.2013.07.004
参考文献(References)：
- (1)李小荣、刘行:《CEO vs CFO:性别与股价崩盘风险》,《世界经济》,2012年第12期。
- (2)李增泉、叶青、贺卉:《企业关联、信息透明度与股价特征》,《会计研究》,2011年第1期。
- (3)刘成彦、胡枫、王皓:《QFII也存在羊群行为吗》,《金融研究》,2007年第10期。
- (4)潘越、戴亦一、刘思超:《我国承销商利用分析师报告托市了吗?》,《经济研究》,2011年第3期。
- (5)沈维涛、朱冠东:《QFII超额收益与中小投资者保护——基于信息披露视角》,第五界中国管理学年会——会计与财务分会场论文集,2010年。
- (6)宋军、吴冲锋:《基于分散度的金融市场羊群行为研究》,《经济研究》,2001年第11期。
- (7)孙培源、施东晖:《基于CAPM的中国股市羊群行为研究——兼与宋军、吴冲锋先生商榷》,《经济研究》,2002年第2期。
- (8)许弘林:《QFII在我国证券市场的实践与影响研究》,博士学位论文,复旦大学,2007。
- (9)许年行、江轩宇、伊志宏、徐信忠:《分析师利益冲突、乐观偏差与股价崩盘风险》,《经济研究》,2012年第7期。
- (10)An H.and Zhang T.,2013,“Stock Price Synchronicity,Crash Risk and Institutional Investors”,Journal of Corporate Fi nance,vol.21,pp.1~15.
- (11)Avery C.and Zemsky P.,1998,“Multidimensional Un certainty and Herd Behavior in Financial Markets”,American Economy Review,vol.88,pp.724~748.
- (12)Bikhchandani S.and Sharma S.,2001,“Herd Behavior in Financial Market”,IMF Staff Papers,vol.47,pp.279~310.
- (13)Brown N.C.,Wei K.D.and Wermers R.,2012,“Ana lyst Recommendations,Mutual Fund Herding and Overreaction in Stock Prices”,Working Paper,University of Maryland.
- (14)Chan K.and Hameed A.,2006,“Stock Price Synchron icity and Analyst Coverage in Emerging Markets”,Journal of Fi nancial Economics,vol.80,pp.115~147.
- (15)Chan K.,Jiang X.,Wu S.and Xu N.,2012,“Analyst Anti-herding and Future Stock Price Crash Risk:Evidence from China”,Working Paper,Renmin University of China.
- (16)Chang C.,2010,“Herding and the Role of Foreign In stitutions in Emerging Equity Markets”,Pacific-Basin Finance Journal,vol.18,pp.175~185.
- (17)Chen J.,Hong H.and Stein C.J.,2001,“Forecasting Crashes:Trading Volume,Past Returns and Conditional Skew ness in Stock Price”,Journal of Financial Economics,vol.61,pp.345~381.
- (18)Chiang T.C.,Li J.D.and Tan L.,2010,“Empirical In vestigation of Herding Behavior in Chinese Stock Markets:Evi dence from Quantile Regression Analysis”,Global Finance Jour nal,vol.21,pp.111~124.
- (19)Choe H.,Kho,B.-C.and Stulz,R.M.,1999,“Do For eign Investors Destabilize Stock Markets?The Korean Experience in 1997”,Journal of Financial Economics,vol.54,pp.227~264.
- (20)Clarke J.,Ornthanalai C.and Tang Y.,2011,“Informa tional Herding:Evidence from Daily Institutional Trades”,Work ing Paper,Peking University.
- (21)Devenow A.and Welch I.,1996,“Rational Herding in Financial Economics”,European Economic Review,vol.40,pp.603~615.
- (22)Dimson,E.,1979,“Risk Measurement When Shares are Subject to Infrequent Trading”,Journal of Financial Econom ics,vol.7,pp.197~226.
- (23)Dornbusch R.and Park Y.C.,1995,“Financial Integra tion in a Second-best World:Are We Still Sure About Our Clas sical Prejudices”,In:Dornbusch,R.,Park,Y.C.(Eds.),Finan cial Opening:Policy Lessons for Korea,Korea Institute of Fi nance,Seoul,Korea.
- (24)Eun C.S.and Huang W.,2007,“Asset Pricing in Chi na’s Domestic Stock Markets:Is there a Logic?”Pacific-Basin Finance Journal,vol.15,pp.452~480.
- (25)Froot,K.A.,Scharfstein,D.S.and Stein J.C.,1992,“Herd on the Street:Informational Inefficiencies in a Market with Short-term Speculation”,Journal of Finance,vol.47,pp.1461~1484.
- (26)Gul F.A.,Kim J.B.and Qiu A.A.,2010,“Ownership Concentration,Foreign Shareholding,Audit Quality and Stock Price Synchronicity:Evidence from China”,Journal of Finan cial Economics,vol.95,pp.425~442.
- (27)Hirshleifer D.and Teoh S.H.,2003,“Herd Behavior and Cascading in Capital Markets:A Review and Synthesis”,Eu ropean Financial Management,vol.9,pp.25~66.
- (28)Hutton A.P.,Marcus A.and Tehranian H.,2009,“Opaque Financial Reports,R2and Crash Risk”,Journal of Fi nancial Economics,vol.94,pp.67~86.
- (29)Jegadeesh N.and Kim W.,2009,“Do Analysts Herd?An Analysis of Recommendations and Market Reactions”,Review of Financial Studies,Vol.23,pp.901~937.
- (30)Jin L.and Myers S.C.,2006,“R2Around the World:New Theory and New Tests”,Journal of Financial Economics,Vol.79,pp.257~292.
- (31)Kim J.B.,Li Y.H.and Zhang L.D.,2011a,“Corpo rate Tax Avoidance and Stock Price Crash Risk:Firm-level Analysis”,Journal of Financial Economics,vol.100,pp.639~662.
- (32)Kim J.B.,Li Y.H.and Zhang L.D.,2011b,“CFOs Versus CEOs:Equity Incentives and Crashes”,Journal of Finan cial Economics,vol.101,pp.713~730.
- (33)Kim J.B.and Zhang L.,2011,“Does Accounting Con servatism Reduces Stock Price Crash Risk?”Working Paper,City University of Hong Kong.
- (34)Kim W.and Wei S.,2002,“Foreign Portfolio Investors Before and During a Crisis”,Journal of International Economics,vol.56,pp.77~96.
- (35)Kothari S.P.,Shu S.and Wysocki P.D.,2008,“Do Managers Withhold Bad News?”,Journal of Accounting Research,vol.47,pp.241~276.
- (36)Kraus A.and Stoll H.R.,1972,“Parallel Trading by Institutional Investors”,Journal of Financial and Quantitative Analysis,vol.7,pp.2107~2138.
- (37)Lakonishok J.,Shleifer A.and Vishny R.W.,1992,“The Impact of Institutional Trading on Stock Price”,Journal of Financial Economics,vol.32,pp.23~43.
- (38)Li W.,Rhee G.and Wang S.S.,2009,“Differences in Herding:Individual vs.Institutional Investors in China”,Work ing Paper,Hong Kong Polytechnic University.
- (39)Morck R.,Yeung,B.and Yu W.,2000,“The Informa tion Content of Stock Markets:Why Do Emerging Markets Have Synchronous Stock Price Movements?”,Journal of Financial Eco nomics,vol.58,pp.215~260.
- (40)Piotroski J.D.and Roulstone D.T.,2004,“The Influ ence of Analysts,Institutional Investors and Insiders on the Incor poration of Market,Industry and Firm-specific Information into Stock Prices”,The Accounting Review,vol.79,pp.1119~1151
- (41)Piotroski J.D.and Wong T.J.,2010,“Institutions and Information Environment of Chinese Listed Firms”,Working Pa per,NBER.
- (42)Roll R.,1988,“R2”,Journal of Finance,vol.43,pp.541~566.
- (43)Scharfstein D.and Stein J.,1990,“Herd Behavior and Investment”,American Economic Review,vol.80,pp.465~479.
- (44)Schuppli M.and Bohl M.T.,2010,“Do Foreign Institu tional Investors Destablilize China’s A-share Markets?”,Jour nal of International Financial Markets,Institutions&Money,Vol.20,pp.36~50.
- (45)Tan L.,Chiang T.C.,Mason J.R.and Nelling E.,2008,“Herding Behavior in Chinese Stock Market:An Examination of A and B Shares”,Pacific-Basin Finance Journal,Vol.16,pp.61~77.
- (46)Trueman B.,1994,“Analyst Forecasts and Herding Be havior”,Review of Financial Studies,vol.7,pp97~124.
- (47)Walter,C.E.and Howie,F.J.T.,2006,Privatizing China-inside China’s Stock Markets,2nd edition,John Wiley&Sons,Singapore.
- (48)Wermers R.,1999,“Mutual Fund Herding and the Im pact on Stock Prices”,Journal of Finance,vol.2,pp.581~622.
- (49)Xu N.,Chan K.,Jiang X.and Yi Z.,2013,“Do Star Analysts Know More Firm-specific Information?Evidence from China”,Journal of Banking and Finance,vol.37,pp.89~102.
- ①在中文翻译中,Herding既称为“羊群行为”,也有的称为“羊群效应”,本文交替使用,不做区分。
- ②资料来源:中国证券监督管理委员会和中国人民银行于2002年12月1日颁布施行的《合格境外机构投资者境内证券投资管理暂行办法》。
- ③由于我国资本市场对QFII存在特殊的限制,例如不可以卖空,并且QFII可以投资的范围也受到限制(如指进入境内市场的最高资金额度和单个投资者的最高投资数额;合格机构投资于单个股票的最高比例),这些也可能导致结果不显著。后文将对此进行稳健性测试。感谢审稿人的宝贵建议。
- ④本文进一步以修正Jones模型估计的应计盈余(ABACC)作为上市公司信息环境的替代变量,研究结论不变。
- ⑤以股价同步性为因变量,同样发现Herding×strategy和Herd_Sell×Strategy的系数都显著为正。
- ⑥篇幅限制,部分稳健性测试的表格不再具体列示,如有需要,可向作者查询。
- ⑦Piotroski和Roulstone(2004)以及Xu等(2013)的研究中均没有做这一步变换,本文在实际回归过程中还使用了R2_diff做为被解释变量,结果与表10保持一致。