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中国管理科学 ›› 2024, Vol. 32 ›› Issue (1): 54-64.doi: 10.16381/j.cnki.issn1003-207x.2021.1041cstr: 32146.14.j.cnki.issn1003-207x.2021.1041

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投资者公共卫生事件关注度与我国行业股票市场信息溢出效应研究

白兰,魏宇()   

  1. 云南财经大学金融学院,云南 昆明 650221
  • 收稿日期:2021-05-27 修回日期:2022-06-24 出版日期:2024-01-25 发布日期:2024-02-08
  • 通讯作者: 魏宇 E-mail:weiyusy@126.com
  • 基金资助:
    国家自然科学基金项目(71971191);云南省教育厅一般项目(2022J0456);云南省科技计划基础研究重点项目(202001AS070018)

Information Spillovers between Investor's Public Health Emergency Attention and Industrial Stocks: Empirical Evidence from TVP-VAR Model

Lan Bai,Yu Wei()   

  1. School of Finance,Yunnan University of Finance and Economics,Kunming 650221,China
  • Received:2021-05-27 Revised:2022-06-24 Online:2024-01-25 Published:2024-02-08
  • Contact: Yu Wei E-mail:weiyusy@126.com

摘要:

2019年年末的突发公共卫生事件对我国金融市场产生了前所未有的巨大冲击,期间投资者对该事件流行态势的关注度(情绪)对我国股票市场的影响作用不容小觑。因此,探讨在此次突发公共卫生事件的不同阶段投资者关注度与我国不同行业股票市场间的相互作用,对政策制定者和各类市场主体来说无疑都具有极其重要的理论和现实意义。在传统静态溢出指数(Spillover Index)基础上,本文运用基于时变参数-向量自回归模型(TVP-VAR)的动态溢出指数法,探究了我国从公共卫生事件前到事件爆发并快速蔓延,再到防控常态化的三个不同阶段下投资者关注与我国不同行业股票市场间的信息动态溢出方向及其强度。实证结果表明,一方面,基于百度搜索指数的投资者关注度在公共卫生事件不同阶段与行业股票市场间的信息溢出作用具有显著差异;另一方面,工业和可选消费行业股票在各阶段始终是信息的发出者,而医药和公用行业股票则基本保持信息接收的状态。上述发现可以为监管者、上市公司和投资者的风险防控措施及投资组合管理等问题提供科学的决策依据。

关键词: 公共卫生事件, 投资者关注, 行业股票, 信息溢出, 时变参数-向量自回归模型

Abstract:

The public health emergency that began in late 2019 had an unprecedentedly large impact on China's financial markets, and the role of investor attention (sentiment) on the pandemic in influencing China's stock market during this period should not be underestimated. Therefore, it is of great theoretical and practical importance for policy makers and market participants to explore the interaction between investors' attention and China's industrial stock markets during the different phases of the pandemic. Based on the traditional static spillover index, the dynamic spillover index method based on the time-varying parameter-vector autoregressive model (TVP-VAR) is used to explore the dynamic information spillovers between investors' attention and China's stock markets from before the epidemic to the outbreak and rapid spread of the epidemic, and then to the normalization of the epidemic prevention. The empirical results show that, on the one hand, there is a significant difference in the information spillover between investor attention based on Baidu index and industrial stock markets at different stages of the pandemic; on the other hand, industrial and optional consumption stocks are always spillover transmitters at different stages of the pandemic. While pharmaceutical and public sector stocks basically remain spillover receivers. The above findings can provide useful supports for regulators, listed companies and investors in making regulatory, risk management and portfolio allocation decisions.

Key words: public health emergency, investor’s attention, industrial stock, information spillover, TVP-VAR model

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