微博、特质性信息披露与股价同步性

被引:132
作者
胡军 [1 ]
王甄 [2 ]
机构
[1] 上海财经大学金融学院
[2] 江西财经大学金融学院
关键词
微博; 股价同步性; 分析师;
D O I
暂无
中图分类号
F832.51 []; F275 [企业财务管理];
学科分类号
1201 ; 020204 ; 1202 ; 120202 ;
摘要
R2(股价同步性)差异是源于公司特质性信息多寡,还是非理性噪声交易,学术界尚没有统一的结论。一个重要的原因是,无论是公司特质性信息的多寡,抑或是非理性因素的多少,通常都无法直接度量。随着信息技术的发展,上市公司通过微博披露了大量的、及时的、新增的、非财务的特质性信息。这一事实为我们区分R2背后的两种经济学解释提供了极好的研究样本。研究发现:(1)开通微博的公司股价同步性更低;(2)微博信息的披露有利于显著提高分析师盈余预测精度。以上两个结论说明R2的差异是源于公司特质性信息的多寡;(3)投资者对于微博发布的信息无法准确理解,此类信息主要通过分析师的信息解读作用进入股价。本文的研究结论对于监管部门制定基于微博的社交网络信息披露准则具有一定的现实意义。
引用
收藏
页码:190 / 206
页数:17
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