中国资本市场的中长期动量效应和反转效应——基于Fama和French三因素模型的进一步研究

基于国内外学者对于中国股票市场的动量效应和反转效应的研究,利用1994~2004年中国股票市场的经验数据,借助于Fama和French的三因素模型,对中国股市的动量和反转效应进行解释。研究结果表明,Fama和French三因素模型的解释力度不大。     

Considering the nuclear option: Hidden benefits and social costs of nuclear power in the U.S. since 1970

Although burning fossil fuels has environmental consequences, many countries have switched away from nuclear power in favor of fossil-fuel fired electricity production after incidents at Three Mile Island, Chernobyl, and Fukushima. This study estimates the substitution between nuclear and fossil-fuel fired electricity generation in the United States. Using an event-study framework, we leverage nuclear plant openings from 1970 to 1995 and forced nuclear plant outages from 1999 to 2014. Plant openings (nuclear outages) reduce (increase) monthly net coal-fired generation by approximately 200 GWh, implying a considerable reduction (increase) in emissions. We find that the substitution between nuclear and coal is not one-to-one, as has been assumed in prior literature. After establishing these stylized facts, we explore the potential underlying forces driving the observed substitution between coal and nuclear.     

创新生态系统如何驱动企业微创新——一个组态视角的fsQCA分析

近年来,微创新是创新研究领域的热点,如何驱动企业微创新是相关研究亟需回答的问题。整合创新生态系统3个层面六大要素,运用模糊集定性比较分析（fsQCA）方法,以18个微创新案例为样本,探讨创新生态系统驱动企业微创新的复杂因果机制。结果发现：第一,单个创新生态系统要素并不构成企业高微创新的必要条件。第二,存在3条高微创新驱动路径,即机会识别主导下的用户驱动型、机会识别主导下的环境与用户参与驱动型,以及机会识别主导下的环境、组织学习与领先用户驱动型。此外,非高微创新驱动路径仅有一条,且与高微创新驱动路径存在非对称关系。第三,机会识别能力作为核心条件出现在高微创新的3个组态及非高微创新一个组态中,说明机会识别能力对企业微创新具有重要作用。     

Flexibility at the Margin and Labor Market Volatility in OECD Countries*

We study the business‐cycle behavior of segmented labor markets with flexibility at the margin (e.g., just affecting fixed‐term contracts). We present a matching model with temporary and permanent jobs (i) where there is a gap in the firing costs associated with these types of jobs and (ii) where there are restrictions in the creation and duration of fixed‐term contracts. We show that a labor market with ``flexibility at the margin'' increases the unemployment volatility with respect to one that is fully regulated. This analysis yields new insights into the interpretation of the recent volatility changes witnessed in the OECD area.     

城市交通问题的产权分析

通过对多个城市的观察,发现《中华人民共和国道路交通安全法》的许多条款形同虚设,得不到切实的执行。本文根据产权理论对这一现象进行了分析,解释当前城市交通问题的主要成因即：车辆的增多、无法识别、十字路口和交通意识。产权的主要作用是帮助人们形成与他人交流的信息的预期,有了清晰界定的产权,就可以减少城市交通中人与人之间的不确定性,减小冲突的发生。为此,本文提出了解决城市交通问题的政策建议,即限制行车数量、增强非机动车辆的识别能力和规范十字路口标识,提高公民城市交通意识。通过减少交易成本,清晰的界定产权等手段规范城市交通,从而帮助行人建立稳定的预期,保证道路畅通。     

基于公司治理的会计行为与伦理制衡研究

会计控制作为公司治理一项重要的制度安排,它是包含企业在内的所有组织和机构正常运转的制度基础,加强会计控制是公司治理的核心。而作为会计控制的主体,即接受委托并具体执行、实施会计控制的单位及个人,其产生的会计行为是企业实施会计控制的具体表现,且其采取的控制对策和实施效果均取决于产生的会计行为的导向。只有从利益导向与伦理约束双视角研究会计行为的动因及产生的效果,才能真正找到有效规范会计行为的科学方法。     

Does Technological Innovation Really Reduce Marginal Abatement Costs? Some Theory,Algebraic Evidence,and Policy Implications

The existing literature models innovation in pollution control as a reduction in marginal abatement costs. We show that this assumption is inappropriate for production process innovations such as fuel switching. Algebraically, we examine the effects of different innovation types on marginal abatement cost curves, showing that some desirable innovations increase marginal abatement costs. Empirically, we estimate marginal abatement costs for sulfur dioxide by measuring the output distance function for electric power in Korea. Regression results confirm that production process innovations did raise marginal abatement costs in this case. One policy implication: economic instruments do not always provide stronger innovation incentives than command-and-control policies.      

A signaling model of environmental overcompliance

We present a theory of unilateral regulatory overcompliance as a signaling device. Firms that have a competitive advantage in the use of a cleaner but more costly technology overcomply in order to signal to an imperfectly informed, benevolent government that compliance costs are low, thereby triggering tougher regulation. We identify the conditions under which such an overcompliance signaling equilibrium arises, showing that there may be over-overcompliance in that firms may overcomply even when tougher regulation is not socially desirable. We also discuss the differential implications of the signaling theory as compared to other theories of unilateral regulatory overcompliance.     

国有银行改革的成本和收益

四家国有商业银行改革的成本和收益需从多角度来考察,从财务角度来看,四家银行通过剥离不良贷款,注资、股改上市带来巨大收益;从社会成本来看,高利差以及高不良贷款率意味着社会为国有商业银行支付较高的隐性成本;从历史角度来看,国有商业银行垄断国家金融业数十年,从理论上说,应当为出资人和国家贡献利润和超额利润,但是,高成本消耗了这种利润的大部分。总体来说,四家国有商业银行的改革是成功的,但并非四家国有商业银行的成功。     

股权激励与代理成本

传统以管理费用率作为代理成本的替代不能恰当地反映管理者在职消费和职务侵占的真实水平,本文用经过Jones模型纠正的费用率作为代理成本的替代,考察了所有权性质、总经理持股与否及持股比例对代理成本的影响。本文提供了私有制下总经理适当持股有利于降低代理成本的可靠证据,为中国上市公司即将展开的股权激励计划提供证据的支持。