哪些因素影响了股市风险传染?——来自行业数据的证据

Factors Affecting the Risk Contagion of the Stock Market:An Evidence from Industry-Level Data

防范系统性风险是我国资本市场改革发展的重要议题,风险传染(risk contagion)是系统性风险的重要特征之一,作为资本市场最主要部分的股票市场,其行业间的风险传染愈益凸显。本文采用ΔCoVaR结合时变SJC-Copula的方法,测算了我国股市行业间产生风险传染和遭受风险传染的程度,并基于实际联系和金融联系实证检验了行业间产生和遭受风险传染的影响因素。研究结果表明,我国股市行业间的风险传染具有异质性和时变性;行业的关联程度越高,信息透明度越差,对其他行业股票产生风险传染的程度越高;行业的关联程度越高、信息越不透明、股票流动性越差,遭受其他行业风险传染的程度越高;投资者情绪能在一定程度上解释行业股票风险传染的时变性,投资者情绪越悲观,行业间的风险传染程度越高。

Statistics show that the phenomenon of “thousand-share hitting limit down” has appeared for 18 times during the period from June 1, 2007 to December 31, 2017. CoVaR combined with time-varying SJC-Copula method is used to measure the degree of inter-industry risk contagion in the Chinese stock market and test the influential factors on the basis of real linkage and financial linkage. The main results show the inter-industry risk contagion of Chinese stock market is heterogeneity and time-varying. Industries that are closely related to other industries and poor in information transparency are more contagious to other industries. Similarly, industries that are closely related to other industries, poor in information transparency and illiquidity in stocks are more susceptible to risk from other industries. Investor optimism is inversely correlated with risk contagion among industries, which explains the time-varying of risk contagion to some extent.