Labour adjustment costs: Estimation of a dynamic discrete choice model using panel data for Greek manufacturing firms

In this paper we estimate a dynamic structural model of employment at firm level. Our dataset consists of a balanced panel of 2790 Greek manufacturing firms. The empirical evidence of this dataset stresses three important stylized facts: (a) there are periods in which firms decide not to change their labour input, (b) there are periods of large employment changes (lumpy nature of labour adjustment) and (c) the commonality is employment spikes to be followed by smooth and low employment growth periods. Following Cooper and Haltiwanger [Cooper, R.W. and Haltiwanger, J. “On the Nature of Capital Adjustment Costs”, Review of Economic Studies, 2006; 73(3); 611–633], we consider a dynamic discrete choice model of a general specification of adjustment costs including convex, non-convex and “disruption of production” components. We use a method of simulated moments procedure to estimate the structural parameters. Our results indicate considerable fixed costs in the Greek employment adjustment.     

成交量、持仓量对我国大豆类期货价差波动影响的实证分析

采用GARCH(1,1)模型就成交量、持仓量对大豆类期货价差波动率的影响进行实证分析,结果显示：当期成交量、持仓量对大豆期货价差波动的整体影响是显著的;滞后成交量、持仓量对大豆期货价差波动的整体影响也是显著的;当成交量、持仓量同时进入条件方差方程时,它们对大豆类期货价差波动的影响整体上也是显著的。这一结论揭示了我国大豆期货市场信息传递过程,验证了我国大豆期货市场的信息非有效性,对期货市场投资者以及期货市场监管者具有一定的借鉴意义。     

农村生活、生产垃圾逆向物流发展模式对比分析

农村逆向物流的实施是发展农村循环经济和改善农村环境的重要途径,在阐述农村逆向物流内涵的基础上,指出了我国农村生活、生产垃圾处理上存在的问题,对比分析了生活、生产垃圾处理逆向物流发展模式,提出农村逆向物流实施可供选择的发展模式,以便有利于逆向物流在农村的有效实施。     

Optimal designs for generalized linear models with biased response

This paper is concerned with the search for locally optimal designs when the observations of the response variable arise from a weighted distribution in the exponential family. Locally optimal designs are derived for regression models in which the response follows a weighted version of Normal, Gamma, Inverse Gaussian, Poisson or Binomial distributions. Some conditions are given under which the optimal designs for the weighted and original (non-weighted) distributions are the same. An efficiency study is performed to find out the behavior of the D-optimal designs for the original distribution when they are used to estimate models with weighted distributions.     

基于计算机模拟的交通灯时间控制问题

文章主要讨论城市交通灯的开启时间间隔的问题,在一些假设的基础之上,把城市交通灯周期时间控制问题进行简化,目的是使得路口的日平均车流量最大。根据实际情况,给出车辆行驶的一套规则,利用计算机仿真技术进行模拟,得到最优交通灯的间隔时间。     

Assessing the Impacts of Capital Inflows on Domestic Economy across the Sub-Saharan Africa Countries

Using GMM models, this paper analyzes the impacts of capital inflows on domestic investment in 44 Sub-Saharan Africa (SSA) countries from 2003–2012. It is found that foreign direct investment across the SSA remains to be the largest percentage share, accounting for 35% of the total capital inflows. FDI inflows have significant positive impacts on domestic investment across the SSA in both short term and long term. Other key macroeconomic factors such as age dependency ratio, domestic economic growth, terms of trade, real effective exchange rate and trade openness also play vital roles in determining domestic investment.     

高职服装专业英语课程教学改革的实践与研究

高职服装专业英语课程的设置,应当以"就业为导向",根据企业对掌握服装英语人才的实际能力需求,进一步明确其在服装专业课程中的定位和设计思路,并以项目为载体对课程内容进行重组,通过多种方式创新教学模式,达到该课程的改革目的和教育教学目标。     

要素价格扭曲与异质性企业区位选择——基于泊松面板回归的实证研究

采用生产函数法,论文详细测算了1998-2007年中国大陆除西藏以外267个城市的要素价格扭曲。接下来,运用中国工业企业数据库中的数据,构建泊松面板回归模型考察了要素价格扭曲对于不同生产效率企业选址产生的影响。按行业、区域分别划分样本以及稳健性检验均表明:(1)较高的要素价格扭曲水平对于该地区新进入的低效率企业的期望值具有显著为正的影响,而对于该地区新进入的高效率企业的期望值则具有显著为负的影响;(2)地区运输成本和环境管制强度对于不同效率企业选址的影响存在异质性,而其他区域特征解释变量对于选址企业数量的影响均显著,且方向与理论预期一致。     

我国生态工业园该如何走出困境?

理论是对事物本质的把握,生态工业园区的理论模型是对生态工业园区本真性反映,是对生态工业园区合理运行机制的根本性揭示.其本质性内容是工业园区内的企业完成物质资料的相互交换和循环,即一个企业排放的废弃物能够成为另一个企业的生产原料.该理论模型既做到节约成本,提高企业经济效益,又使废弃物得到最大化利用和充分循环,还减少了对自然环境的污染.就目前而言,我国的生态工业园区创建仍然处于初级阶段,潜在的环境经济效益仍需较长时间的努力和一定资金的投入才能显现.最重要的体现是生态工业园区内的经济发展和生态环境保护并未得到平衡的发展,仍然存在以环境污染为代价的现象.     

信用平稳下商业银行信用风险测度模型及应用——基于模糊综合评判法

科学高效的商业银行信用风险测度模型,是实现商业银行信用风险监测目标的重要保障。商业银行信用风险主要来源于贷款企业层面,贷款企业信用质量状况将对应着商业银行信用风险水平。对此,从贷款企业的财务与非财务两个层面设计信用风险的测度指标体系,运用模糊综合评判法构建信用平稳下商业银行信用风险测度模型,并给出信用风险测度模型的应用实例。研究发现,在信用平稳下,依赖于专家评判及打分方式,使得模糊综合评判法对于解决商业银行信用风险测度问题具有很好的操作便利性;也可为我国商业银行体系构建科学高效的信用风险监测机制提供重要的理论指导与决策参考。