A global meaning of supply chain social sustainability

Abstract

The purpose of this research is to help reduce tensions in supply chain social sustainability (SCSS) decisions by providing a common global, contextual definition of social sustainability. This exploratory study utilised an inductive structured interview method to capture SCSS concept meanings. Those interviewed are from, have lived, and worked in developed economies, emerging economies and the base of the pyramid (BOP) economies. The results present a new global baseline definition of SCSS to inform theory and practice by finding that SCSS meanings differ not only between the different levels of economic development, but also within the levels as well. Culture, community and whether basic human needs are met all weigh into perspectives of what this concept is and should entail; a broad, contingent definition is most appropriate moving forward for sustainability planning and execution. Further research with stakeholders in more countries and communities is needed to validate our proposal.     

经济政策不确定性与企业现金持有策略——基于中国经济政策不确定指数的实证研究

研究经济政策不确定性对企业现金持有策略的影响,发现企业在经济政策不确定性上升时会增持现金,这种现金增持行为在融资约束较为严重、股权集中度较低以及学习能力较差的企业中更加明显.此外,本文还采用中介效应分析方法,发现企业在经济政策不确定性上升时增持的现金,有一部分是以放弃当前投资机会为代价的,被放弃的投资机会构成了企业在经济政策不确定性上升时增持现金的机会成本.     

中国入世以来经济增长、外贸及FDI对就业的影响

文章建立了关于就业的线性计量模型,并通过中国30个省2002-2006年的面板数据,主要检验了中国入世以来经济增长、外贸、FDI等对于就业的作用。经济增长仍显著促进了就业增加;FDI促进了就业增加,但拉动作用较小,东部与西部的FDI并未显著促进就业;总体上,出口拉动了就业增加,但其作用也不是很大,仅东部的出口显著促进了就业增长;进口显著抑制了国内就业。并在上述分析基础上,提出了相应的政策见解。     

CreditRisk+模型采用Poisson分布所产生的经济资本计量误差分析

本文对CreditRisk+模型采用Poisson分布近似债务人违约事件分布这一关键步骤进行系统研究。首先分析了Poisson分布在CreditRisk+模型中的作用,并从理论上证明了采用Poisson分布作为债务人违约事件分布的近似,会导致CreditRisk+模型计算出来的经济资本高估贷款组合的实际风险水平;然后以债务人违约事件服从两点分布并采用蒙特卡罗模拟计算出来的经济资本为参照值,对债务人违约概率的大小与这一近似所引起的经济资本计量误差率进行了敏感性试验,发现为将这一近似所引起的误差率控制在10%的范围内,债务人违约概率的取值不应超过0.2。     

商品金融化背景下大宗商品指数收益机制转换

基于虚拟变量Markov机制转换模型,选取具有代表性的国际商品指数-标普高盛商品指数(S&P GSCI)及道琼斯大宗商品指数(DJCI)为研究对象,探寻大宗商品指数收益率机制转换出现的规律与诱因.实证结果表明:修正后的模型能较好地反映大宗商品指数收益率波动性呈现出的“中-高-中高-低-中”的阶段性变化,在阶段变换的拐点处商品指数呈现出具有转折意义的“V”形走势;金融危机前后的流动性冲击改变机制转化的概率.研究结果可以为预测大宗商品市场走势及阶段性转折点提供参考.     

无偏好市场下制造/再制造系统最优生产决策

尽管再制造可以重新获得产品的附加价值,但是再制造产品和新产品具有一定的替代性,厂商在各期应该采用何种生产策略?本文选取单一制造厂商,首先讨论无偏好市场下两期再制造最优生产策略,建立厂商利润最大化的经济优化模型;然后给出了再制造成本节约临界值,以便厂商在不同的再制造成本区域内采取合适的价格和产量决策策略;进而将模型拓展,研究无限期的最优产量和定价策略。由于不同产品的再制造成本节约s的比例并不相同,本文通过优化所得的结论进行数据模拟,研究产品回收率和降级率对s*的影响,s对厂商的产量、定价决策及利润的影响,进而分析降级率对产量和价格的影响,为厂商制定产品设计、生产和回收决策提供依据。     

基于非参数时变Copula模型的美国次贷危机传染分析

金融危机传染分析是国际金融领域中的重要课题,本文对Copula变点检测方法进行推广,采用时变非参数阿基米德Copula模型检验金融危机传染的存在性及其变化趋势,以时变尾部相依系数的大小来度量危机传染程度,并结合系数的变化趋势和时间段对金融危机传染效应进行分析.最后选择全球六个主要股票市场指数和S&P500指数进行危机传染实证研究,得出次贷危机对不同国家或地区的传染效应有所差别.     

Evaluating and Visualizing the Economic Impact of Commercial Districts Due to an Electric Power Network Disruption

Critical infrastructure networks enable social behavior, economic productivity, and the way of life of communities. Disruptions to these cyber–physical–social networks highlight their importance. Recent disruptions caused by natural phenomena, including Hurricanes Harvey and Irma in 2017, have particularly demonstrated the importance of functioning electric power networks. Assessing the economic impact (EI) of electricity outages after a service disruption is a challenging task, particularly when interruption costs vary by the type of electric power use (e.g., residential, commercial, industrial). In contrast with most of the literature, this work proposes an approach to spatially evaluate EIs of disruptions to particular components of the electric power network, thus enabling resilience‐based preparedness planning from economic and community perspectives. Our contribution is a mix‐method approach that combines EI evaluation, component importance analysis, and GIS visualization for decision making. We integrate geographic information systems and an economic evaluation of sporadic electric power outages to provide a tool to assist with prioritizing restoration of power in commercial areas that have the largest impact. By making use of public data describing commercial market value, gross domestic product, and electric area distribution, this article proposes a method to evaluate the EI experienced by commercial districts. A geospatial visualization is presented to observe and compare the areas that are more vulnerable in terms of EI based on the areas covered by each distribution substation. Additionally, a heat map is developed to observe the behavior of disrupted substations to determine the important component exhibiting the highest EI. The proposed resilience analytics approach is applied to analyze outages of substations in the boroughs of New York City.     

珠三角农业经济的转型及其原因分析

通过对珠三角农业经济发展在这20多年中发生的变化及原因分析,旨在说明珠三角地区农业已经走过了传统农业阶段,步入了现代农业的门槛,且正处于实现现代农业的过程之中。     

广西经济发展缓慢的原因分析

本文从东部沿海开放时的行动滞后、发展战略、产业结构调整、投资理念和资源主导型经济等几个方面分析了广西经济发展缓慢的主要原因,并简略地提出广西未来经济发展的对策。