Some Cracks in the Empire of Chance (Flaws in the Foundations of Reliability)

Making quantified statements about the uncertainty associated with the lifelength of an item is one of the most fundamental tasks of reliability assessment. Most practitioners routinely do this using one of the several available statistical techniques. The purpose of this paper is two-fold. The first is to give the user an overview of the key tenets of two of the most commonly used parametric approaches. The second is to point out that these commonly used approaches involve strategies that are either ad hoc, or are in violation of some of the underlying tenets. A method that is devoid of logical flaws can be proposed, but this method is difficult to implement. The user must therefore resign to using that technique against which the fewest objections can be hurled.     

相对要素价格均等化:理论模型与实证检验

本文从CES总成本函数的角度,纳入技术水平、要素质量和要素价格等差异化因素,推导了相对要素价格均等化的实证检验模型。中国省际间面板数据(1998-2008)的实证检验结果表明中国省际间存在相对要素价格多锥形均衡,劳动力要素相对价格显著不等,进而从要素供给弹性、国际市场需求变化和产出调整机制等角度做了阐释。     

中国加工贸易的工资分配效应研究

国际外包的蓬勃发展:一方面,改变了国际贸易格局;另一方面,催生新的贸易方式—中间产品贸易,这种新型的贸易方式会影响一国不同类型劳动者的工资收入。本文以中国加工贸易作为中间产品贸易的衡量,选取1996～2008年数据作为样本进行时间序列回归,结果表明,加工贸易规模与制造业技能工人的相对工资成反方向变动。最后本文结合实证分析结果认为:我国应该积极参与中间产品贸易,扩大加工贸易规模,以增强其对缓解就业、缩小工资差距的作用。     

The relative and incremental explanatory powers of dirty surplus items for debt interest rate

This study investigates the relationship between dirty surplus items on the balance sheet and the cost of debt for Japanese firms. We focus on three dirty surplus items—unrealized gains and losses on available-for-sale securities (SEC), foreign currency translation adjustment (FOC), and land revaluation surplus (LAND). While many previous studies on dirty surplus adopted the value-relevance perspective, we examine the effect of dirty surplus items on the interest rate spread of bonds from the bond market perspective. We use the [Vuong, Q. H. (1989). Likelihood ratio tests for model selection and non-nested hypotheses. Econometrica, 57, 307–333] test to evaluate the relative explanatory power of the equity ratio with and without dirty surplus items for the interest rate spread on bonds issued. We find evidence that the equity ratio with dirty surplus items is more strongly associated with the debt interest rate than that without dirty surplus items. The results suggest that the total amount of dirty surplus items have statistically significant explanatory power for the interest rate spread. However, some dirty surplus items do not have explanatory powers for the bond interest rate spread. While FOC has relative and incremental explanatory powers and SEC has only incremental explanatory power, LAND has neither relative nor incremental explanatory power for the bond interest rate spread. The results mean that FOC and SEC are useful to Japanese bond investors.     

“好”的不确定性、“坏”的不确定性与股票市场定价——基于中国股市高频数据分析

不确定性并不是都是“坏”的,“好”的不确定性也同样存在。本文采用Barndorff-Nielsen et al.(2010)提出的已实现半方差作为股票市场“好”的不确定性和“坏”的不确定性的代理指标,并在此基础上构建了相对符号变差(RSV),分析RSV对中国股市定价的影响。基于2007-2017年中国A股5分钟高频数据的实证研究发现:(1)与理论解释相一致,RSV与股票收益之间呈现负相关关系。无论是基于单变量分组、双变量分组还是公司层面的截面回归,这种影响在经济上和统计上都显著。(2)RSV是独立于已实现偏度的一个重要定价因子,且RSV对股票的定价能力强于已实现偏度的定价能力。(3)RSV对中国股市的影响是状态依存的,相对于经济景气程度高的状态,在经济景气程度低的状态下RSV定价影响更大。(4)基于RSV构建的投资组合的表现明显优于市场超额收益率组合、SMB组合和HML组合的表现。     

基于个税递延政策的企业年金保障水平研究

国家明确以税收优惠的形式鼓励和引导企业和个人参加企业年金计划,并于2014年实施了个税递延政策。基于指标模型构建和数据模拟,本文对我国企业年金在个税递延政策实施前后的保障水平进行了比较,通过参数敏感性分析考察了投资收益、工资增长、退休年龄和缴费比例等因素的影响。研究发现,实施个税递延政策后企业职工的养老保障水平在较大程度上低于政策实施前,但不同性别、不同收入水平和不同缴费比例的企业职工保障水平降低的程度有所差异。收入水平和缴费比例越高的男性职工,个税递延政策实施后保障水平降低的幅度越高,但对女性职工而言,这种影响要弱一些。进一步,可以通过增加投资收益、延迟退休年龄和提升缴费比例等方法来提高企业职工的养老保障水平,这与目前正在进行的一系列改革方向也一致。     

国际贸易对我国行业间收入分配的影响——基于制造业面板数据的实证分析

本文运用我国1998-2006年27个制造业行业的面板数据对国际贸易的行业间收入分配效应进行了实证研究。研究发现,从总体上看,出口对行业相对工资有正向的上拉作用,进口对行业相对工资有负向的下拉作用。但进出口对不同类型行业的影响程度和方向不同,出口贸易对资本密集型和劳动密集型制造业行业的相对工资均有上拉作用,且对前者的促进作用大于后者;进口贸易对劳动密集型制造业行业的相对工资有下拉作用,而对资本密集型制造业行业的相对工资有上拉作用。基于上述结论,促进出口,提高劳动密集型产品的附加值,适当控制最终消费品等产品的进口,有助于缩小行业收入差距。