新闻媒体报道与资本市场定价效率——基于股价同步性的分析

被引:886
作者
黄俊 [1 ]
郭照蕊 [2 ,3 ]
机构
[1] 上海财经大学会计与财务研究院
[2] 上海师范大学商学院
[3] 上海交通大学上海高级金融学院
关键词
媒体报道; 股价同步性; 公司特质信息; 定价效率;
D O I
暂无
中图分类号
F832.51 [];
学科分类号
摘要
基于我国证券市场股票价格"同涨同跌"现象,本文利用2007~2012年上市公司数据,考察了新闻媒体报道对资本市场定价效率的影响。我们研究发现,媒体报道与股价同步性显著负相关,即随着媒体报道的增多,更多公司层面信息融入股票价格,股价同步性降低。进一步的分析显示,对于分析师跟踪人数越多及机构投资者持股比例越高的公司,股价同步性受媒体报道影响而下降得更明显;相反,对于业务复杂公司,媒体报道对股价同步性的减缓作用减弱。最后,我们的研究表明,媒体报道对公司股价同步性的影响主要通过负面报道产生,而且,网络新闻媒体报道也有助于公司股价同步性的降低。
引用
收藏
页码:121 / 130
页数:10
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