经济政策不确定性与企业投资趋同行为

文章以2003-2017年A股非金融类上市公司为研究样本,考察经济政策不确定性对企业投资趋同行为的影响。研究发现,经济政策不确定性的升高会显著增强企业投资趋同行为,该影响效应在信息优势企业有所减弱,在资产不可逆程度较高企业有所增强。分行业检验发现,在管制性行业以及景气度较低行业中,经济政策不确定性对企业投资趋同行为的影响减弱。进一步研究发现,在经济政策不确定性不断攀升的背景下,实体投资趋同性会带来更为严重的金融化,特别是在行业实体投资总体趋于放缓的情况下,企业金融化现象更加严重。该研究为宏观经济波动下企业投资趋同行为提供了经验证据。     

Time-varying inter-urban housing price spillovers in China: Causes and consequences

The spatial spillovers of housing prices across regions are well documented by a large body of previous studies. This paper tries to investigate the dynamic (time-varying) evolution of spatial interactions and their underlying driving factors intensively. Using a recently developed Generalized Autoregressive Score (GAS) model, this paper examines the time-varying spatial spillovers of housing prices in 70 major and median cities of China from 2006 to 2019. We find that the GAS model can well capture the impact of time-varying critical events of Chinese real estate market on the whole. However, different regions display heterogeneous variation patterns over time. Further investigation shows that inter-regional labor mobility and trades are two major channels, accounting for 1.25% and 2.58% of the monthly standard deviations of spatial spillover effects from one city to another, respectively. We also characterize and distinguish between three time-varying patterns of spatial spillovers within different regions of China. Our results shed lights on the understanding of spatial spillovers across regional real estate markets across different city network structures within China.     

Influence of acquirer boards on M&A value creation: Evidence from Continental Europe

We examine how the size and the composition of acquirer boards are associated with shareholder abnormal returns for 2,230 M&As made by listed firms in Continental Europe. Although board size proves insignificant, our findings do offer some evidence as to a beneficial effect of board diversity on M&A value creation. Gender diversity appears marginally positively associated with acquirer shareholder abnormal returns. The fraction of foreign directors is in general not significantly positive, unless the rule of law in the acquirer country is weak. Nonetheless, nationality diversity in the board turns out harmful in purely domestic takeovers. The influence of age diversity is marginally positive, yet only in domestic and horizontal takeovers. Next, the fraction of independent directors has a robust positive effect on the acquirer CAR, while directors with multiple board appointments prove valuable especially through preventing firms from pursuing poor takeovers. Finally, CEO duality is detrimental only in industry‐diversifying deals initiated by acquirers that are not controlled by an individual or a family shareholder. Any negative CEO‐duality effect is mitigated when the acquirer‐country rule of law is strong.     

加强人防工程安全管理工作的探讨

国防工程发展建设至今,基本已经趋于健全,其包含万千,由众多部分组成。在国防工程的众多组成部分之中,对于城市以及民众具备有重要意义的人防工程就不可不提,其存在是将深埋地下的空间与资源进行最大化发掘及利用,从而做到与其他国防工程组成部分契合,实现立体化国防工程的建设发展。人防工程虽然不显于人前,但其重要性却无人可以忽略,其对于城市建设发展、民众生命利益保障奠定着坚实基础。     

关于铁路单线隧道接触网弓形腕臂预配平台的相关研究

为降低铁路单线隧道接触网弓形腕臂预配施工难度,论文研究了一种接触网弓形腕臂预配平台,结合单线隧道内弓形腕臂数据精测技术及计算软件,精确测量预配,保证弓形腕臂的安装精度和质量,使弓形腕臂在现场施工中一次成优。论文结合实际,就某铁路单线隧道接触网弓形腕臂预配平台作具体分析。     

Share pledging,payout policy,and the value of cash holdings

Share pledging for insiders’ personal bank loans is associated with the agency problems of insider risk aversion and stock price crash risk. We examine the relation between insider share pledging and the value of cash holdings using the pledging data of listed firms in Taiwan. We find that the value of cash holdings is lower for pledging firms, especially for those that are relatively more risk averse. Pledging firms that repurchase shares have a higher marginal value of cash than those with other payout methods, likely due to the role of repurchases in reducing the stock price crash risk. Our results show how insiders’ personal financing incentives arising from share pledging would affect the value of cash holdings from the perspective of agency problems and payout policy.     

A supply-demand model of public sector size

We develop a supply-demand model for the public sector with a political equilibrium. The model considers the inefficiencies caused by taxes and includes costs associated with the provision of public goods to consumers. We show that the size of the public sector may depend on the median voter's income, population size, costs associated with paying tax, and quality of institutions, all of which reflect the costs of provisioning public goods. The estimates for the Organisation for Economic Co-operation and Development member countries are compatible with theoretical predictions; however, they do not confirm Wagner's law, which holds that the public sector share does not grow with an increase in income. A greater dependency ratio and the Gini coefficient increase demand for redistribution policies. Greater government effectiveness is a supply-side factor that increases the public sector's share in an economy.     

优化营商环境,推动发展高质量经济

促进中国经济高质量发展的必由之路是优化营商环境,提升区域竞争力。目前我国面临着国际内外的复杂局势,经济未来的发展趋势不容乐观,为此我们要深入落实新的发展理念,建立新的发展思路,构建新的发展格局。优化营商环境应实现建立服务型政府,实现企业经营环节的全覆盖,降低制度性交易成本、建立完善的商业系统生态链、打造具有中国特色的营商环境。     

数字经济对中国全要素生产率的影响机理:提升效应还是抑制效果？

数字经济是新时代引领中国经济高质量发展的关键抓手。然而现阶段数字经济普惠性发展尚未实现，掣肘着其对国内全要素生产率的提升力度。文章在理论分析的基础上，基于熵权TOPSIS法测算了2012-2018年中国数字经济发展水平指数，探讨了中国数字经济对全要素生产率的影响机理。研究发现：数字经济的发展显著提升了中国全要素生产率水平，但区域层面上，东部地区的数字经济发展明显领先于中西部地区，引领着中国全要素生产率快速增长。从全要素生产率的分解指标来看，数字经济推动了技术效率提升，但现阶段国内关键核心技术环节薄弱以及数字产业化带来的人才和资金的虹吸效应导致数字经济对技术进步产生了阻碍作用。此外，当前数字经济对不同产业的渗透度存在明显的不均衡性，筑高了创新资源的流动壁垒，影响产业间协调创新及合理化布局，进而抑制了对全要素生产率的提升力度。进一步的机制检验表明在创新环境的支持下，人才集聚及金融规模强化了数字经济对全要素生产率的提升力度。