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Gui, Junxiao. Research on the Impact of economic policy uncertainty and Investor sentiment on the growth enterprise market in China. Doctoral Degree(Digital Innovation and Financial Technology). Chiang Mai University. Library. : Chiang Mai University, 2025.
Research on the Impact of economic policy uncertainty and Investor sentiment on the growth enterprise market in China
Abstract:
Growth Enterprise Market (GEM) in China was officially established in October 2009. After more than a decade of development, it has become an important financing platform for emerging small and medium-sized enterprises (SMEs) and high-tech enterprises. Due to its high growth potential and high risk, the price-earnings ratio of the GEM market is generally high, and the future development trend is uncertain. The Chinese government and regulatory authorities have introduced a series of policies to stabilize the operation of the stock market, but the release time and specific content of the policies remain uncertain, leading to uncertainties in the expectations of investors and other market participants regarding the effects of economic policies. In addition, the China's stock market has the characteristics of obvious policy orientation and a relatively high proportion of individual investors. From the perspective of behavioral finance, investors' non-rational emotions such as ambiguity aversion may lead to non-rational investment behaviors, which in turn may cause abnormal fluctuations in the stock market. Therefore, studying the impact of economic policy uncertainty (EPU) and investor sentiment (IS) on China's GEM, especially from the perspectives of the overall market and individual enterprises, is of great significance for modelling reasonable economic policies, stabilizing company stock prices, and enhancing investors' rational investment sentiment. This dissertation defines the performance of China's GEM as market returns, stock price volatility, and stock price crash risk, and uses monthly data as samples. It selects a representative EPU index and measures the IS index of the GEM based on internet text information to explore the impact of EPU and IS on China's GEM. At the same time, this dissertation also examines the impact of enterprise property rights differences, asset size differences, industry differences, and stock market status differences on GEM listed companies, and for the first time integrates these factors into a framework to analyze the impact of EPU and IS on the performance of China's GEM. This dissertation takes the listed companies on China's GEM and their related data from January 2016 to December 2023 as the research sample. The IS index constructed through text data analysis reflects to a certain extent the overall trend of investor sentiment in China's GEM. Combined with EPU, the following research conclusions are drawn: First, EPU is negatively correlated with the returns of GEM, but not completely negatively correlated,and there exists a time-varying relationship ; EPU is significantly positively correlated with the stock price volatility and stock price crash risk of the GEM. Second, IS based on the Internet moderates the impact of EPU on the stock price volatility and stock price crash risk of the GEM. Third, the heterogeneous characteristics of enterprises make the impact of EPU and IS on property rights differences, different asset size enterprises differences ,stock market status differences, and industry differences. The research conclusions of this dissertation not only enrich the understanding of the influencing factors of the performance of the GEM, but also provide important implications for policymakers. Policymakers should focus on the long-term effects of EPU and leverage internet information for risk warnings. By monitoring and addressing investors' sentiments, they can help mitigate the risk of stock price crashes. Meanwhile, policymakers should oversee and manage online information disclosed on social media platforms, such as stock forum communities, to curb the dissemination of online rumors.