农村基础设施投资与农村发展研究述评

农村基础设施具有公共物品的特征,典型地应由公共部门提供。大量研究表明农村基础设施投资对农村发展具有正效应,然而对引起正效应的具体联系和因果关系的研究较少,所以除了建议增加公共基础设施投资之外,很难提出更多的具体政策建议。本文对农村基础设施与农村发展的主要文献进行了系统的梳理,将农村基础设施对农村发展的影响划分为宏观经济效应、微观经济效应和分配效应三种,并展望了该领域的研究前景。     

股指期货对股票市场效率的影响实证分析

通过分析香港恒生指数及其指数期货,研究发现,股指期货对现货价格具有价格发现作用。为防止伪回归问题对分析结果的影响,故采用协整检验和格兰杰（Granger）因果关系检验,就股指期货对市场效率的影响进行验证。研究结果显示,股指期货对现货指数确实存在价格发现功能。     

探析我国封闭式基金折价之谜——基于行为金融学的实证研究

封闭式基金的折价是各国基金市场普遍存在的一种现象,而我国封闭式基金折价问题与国外相比更加严重。本文基于我国18只封闭式基金从上市起至2013年的折价率、基金业绩等相关数据,运用Johansen协整检验和建立面板数据随机效应模型等方法进行检验分析,证明了噪声交易者的趋同交易行为是导致不同基金折价率曲线高度一致的原因,而投资者情绪是导致在基金市场繁荣交易时折价率大幅缩减的重要原因,从而验证了行为金融学关于封闭式基金折价之谜的观点,即噪声交易者风险的存在是基金折价交易的原因,为我国基金业的健康发展和投资者情绪的指标及运作机理研究提供一些参考。     

我国经济增长与能源消费的内在关系研究——基于VECM模型格兰杰因果检验与灰色关联度分析

将能源消费总量纳入到柯布道格拉斯生产函数中,运用中国1990～2011年的时间序列数据,通过Granger因果检验,研究我国能源消费与经济增长之间的Granger因果关系。研究发现：不论在短期还是长期中,GDP与固定资本存量,GDP与能源消费总量都互为双向格兰杰因果关系;而固定资本存量与能源消费则不同,在短期时,不存在格兰杰因果关系,但在长期均衡中,它们之间也存在双向格兰杰因果关系。为进一步明确在能源消费中,哪个产业的能源消费对我国经济增长的贡献率最大,构建了灰色关联度模型,研究发现第三产业对我国经济增长的贡献率最大。最后根据研究结论,提出优化产业结构、大力发展低能耗、高产出的第三产业．充分发挥资源配置效率．建立资源节约型的经济发展模式的建议．     

Information and communications technology infrastructure and firm growth: An empirical study of China's cities

Despite the importance of information and communications technology (ICT), previous studies of the business value of information technology have yielded mixed results. This study provides new empirical evidence that demonstrates the impact of cities' ICT on firm performance. A series of panel datasets are assembled to measure the improvement of city's ICT infrastructure and the change of firm performance during the years 2001–2016 in China. The findings demonstrate that city's ICTs positively promoted firm performance, including financial profitability, marketing performance and innovation performance. Instrumental variables are employed to verify the positive impact of city's ICTs infrastructure on firm profitability. Taking advantage of an exogenous variation of telecommunications upgrade as a natural experiment, this study uses the difference-in-difference approach to establish causality between cities' ICT infrastructure and firm profitability. Mechanisms are explored, which shows that better labour quality, lower costs and higher transparency are the three possible channels through which ICTs influence firm profitability.     

The outbreak of COVID-19 and stock market liquidity: Evidence from emerging and developed equity markets

The outbreak of the novel corona virus has heightened concerns surrounding the adverse financial effects of the outbreak on stock market liquidity and economic policies. This paper contributes to the emerging strand of studies examining the adverse effects of the virus on varied aspect of global markets. The paper examines the causality and co-movements between COVID-19 and the aggregate stock market liquidity of China, Australia and the G7 countries (Canada, France, Italy, Japan, Germany, the UK and the US), using daily three liquidity proxies (Amihud, Spread and Traded Value) over the period December 2019 to July 2020. Our empirical analysis encompasses wavelet coherence and phase-differences as well as a linear Granger causality test. Linear causality test results suggest that a causal relationship exists between the number of cases of COVID 19 infections and stock market liquidity. To quantitatively examine the degree of causality between COVID-19 outbreak and stock market liquidity, we employ the continuous wavelet coherence approach with results revealing the unprecedented impact of COVID-19 on stock market liquidity during the low frequency bands for countries that were hard hit with the COVID-19 outbreak, i.e., Italy, Germany, France, the UK and the US. Further, evidence shows that there is a heterogeneous lead-lag nexus across scales for the entire period of the study.