摘要
本文采用文本向量化的方法 ,对2007—2015年中国A股上市公司年报的管理层讨论与分析(MD&A)所披露的信息含量加以度量,研究其对股价崩盘风险的影响。研究发现,MD&A的信息含量越高,未来股价崩盘风险越低。将MD&A进一步划分为回顾部分和展望部分后发现,仅有展望部分中的信息含量能够显著降低未来股价崩盘风险。在控制内生性问题之后,本文的结论依然成立。本文还分别从文本可读性和信息不对称的角度出发,研究它们对二者关系的影响。结果表明,信息的可读性越高,信息不对称程度越高,展望部分的信息含量对股价崩盘风险的降低作用越大。在重新定义股价崩盘风险的计算区间以及控制股价同步性之后,MD&A展望部分的信息含量依然能够显著降低股价崩盘风险,表明本文的结论是稳健的。本文从文本信息的角度丰富了股价崩盘风险影响因素的研究,同时也从增量信息的角度完善了MD&A信息有用性的研究,具有重要的理论和现实意义。
In this paper, we discuss the impact of informative content of Management Discussion and Analysis (MD&A) on stock price crash risk using the method of text vectorization. Using the MD&A in annual reports of China A-share listed firms from 2007 to 2015, we find that the informative content of MD&A can reduce future stock price crash risk, and the informative content of preview section has significant effects on stock price crash risk, while that of review section does not. After controlling endogeneity, the conclusions still stand. Further, we study the influence of informative content of preview section on crash risk from the aspects of readability and information opaqueness. The results show that the higher readability and higher information opaqueness, the greater impact of informative content has on stock price crash risk. Finally, after changing the calculation of crash risk, and controlling the impact of stock price synchronicity, the informative content of preview section still reduces stock price crash risk. This paper enriches the influencing factors of stock price crash risk and improves the study of the usefulness of MD&A from the perspective of incremental information, which has important theoretical and practical significance.
出处
《中国工业经济》
CSSCI
北大核心
2017年第12期132-150,共19页
China Industrial Economics
基金
国家自然科学基金面上项目"卖空机制
私有信息与知情交易"(批准号71772174)
国家自然科学基金青年项目"机构投资者股权集中度影响股价崩盘风险的传导路径研究"(批准号71602053)
财政部全国会计科研课题重点项目"会计信息化发展研究"(批准号2015KJA010)
关键词
管理层讨论与分析
股价崩盘风险
文本向量化
信息含量
management discussion and analysis (MD&A)
stock price crash risk
text vectorization
informative content