B2C电子商务物流配送中心选址模型研究

分析了B2C电子商务的发展趋势、发展瓶颈即物流配送成本,为优化物流成本,构建了基于不同路段运输单价不同的最优运输费用的物流配送中心选址模型.     

Blocked-Error-R 2: A Conceptually Improved Definition of the Proportion of Explained Variance in Models Containing Loops or Correlated Residuals

Bentler and Raykov (2000, Journal of Applied Psychology 85: 125–131), and Jöreskog (1999a, http://www.ssicentral.com/lisrel/column3.htm, 1999b http://www.ssicentral. com/lisrel/column5.htm) proposed procedures for calculating R ² for dependent variables involved in loops or possessing correlated errors. This article demonstrates that Bentler and Raykov’s procedure can not be routinely interpreted as a “proportion” of explained variance, while Jöreskog’s reduced-form calculation is unnecessarily restrictive. The new blocked-error-R ² (beR ²) uses a minimal hypothetical causal intervention to resolve the variance-partitioning ambiguities created by loops and correlated errors. Hayduk (1996) discussed how stabilising feedback models – models capable of counteracting external perturbations – can result in an acceptable error variance which exceeds the variance of the dependent variable to which that error is attached. For variables included within loops, whether stabilising or not, beR ² provides the same value as Hayduk’s (1996) loop-adjusted-R ². For variables not involved in loops and not displaying correlated residuals, beR ² reports the same value as the traditional regression R ². Thus, beR ² provides a conceptualisation of the proportion of explained variance that spans both recursive and nonrecursive structural equation models. A procedure for calculating beR ² in any SEM program is provided.     

论我国行政指导的运行及制度构想

行政指导已成为现代市场经济国家行政发展的新趋势,在我国也有了社会经济背景、政府行政背景、民众意识背景和法学理论背景等方面的运行基础。行政指导在我国行政实务中开始得到广泛运用,其独特作用已经显露,但实践和制度上仍有很多不可回避的问题,需要对行政指导在实体规范、程序规范、监督救济机制以及配套规范方面进行制度设计。     

刍议“3+2”模式高职教育管理问题及对策

“3+2”模式高职教育管理问题日益凸现,课程设置部分重复,教育质量呈下降趋势,高职教育资源不能充分利用。文章从影响“3+2”模式高职教育管理质量的内、外部原因进行分析,提出了一些对策,以努力提高“3+2”模式高职教育的质量。     

2,3-环氧丙基三甲基氯化铵壳聚糖接枝共聚物的制备研究

通过2,3-环氧丙基三甲基氯化铵(ETA)对壳聚糖进行接枝改性,探讨了影响其接枝改性的主要因素。结果表明,壳聚糖与ETA接枝的较合适反应条件是:壳聚糖与ETA摩尔比为1∶3、pH值为7、温度80℃、时间10小时、引发剂浓度0.5mmol/L;最后,通过红外光谱图进一步表征了壳聚糖接枝物的生成。     

论在中国B2C发展的若干问题

我国电子商务的环境在不断改善,接受网上购物方式的消费者越来越多.但2001年中国B2C并没有表现出太多令人欣喜之处,甚至部分曾经领先的电子商务网站不得不面对生死存亡的抉择.造成这种现状的原因不仅仅是电子商务整体的一些原因,也包括一些影响B2C发展的特有原因.如市场发育问题、互联网的环境和条件问题、信用制度完善的问题、物流配送问题、立法问题、具体经营问题等.这些瓶颈若不能得到合理的解决,对于电子商务发展的影响将会是巨大的.     

“智能+”时代背景下跨学科应用型物流人才培养模式探究

通过对“智能+”时代背景下应用型物流人才社会需求变化的调查分析,提出对现有物流专业在知识、能力、素质结构体系方面的调整建议,围绕“课程体系改革”及“教学工作改革”两个重点领域,依托“四个平台”,对构建创新型“智慧物流”专业的“ILTTM2+4”培养机制进行了深入探讨。     

Regulating Availability with Demand Uncertainty

Abstract. I evaluate a new German regulation that requires retail discounters to guarantee the availability of their products in bargain sales. The regulation is meant to prevent loss leaders. Retailers undermine the regulation's rationale by claiming that rationing is due to demand uncertainty. This paper shows that under demand uncertainty the regulation has ambiguous welfare effects. Effectively, it raises production, which, under imperfect competition, tends to be beneficial. However, the regulation overshoots and decreases welfare if it requires availability for a state of high demand that is relatively unlikely. In this case more sophisticated regulation is required.     

Private labels, price rivalry, and public policy

The article examines (i) why low-quality private labels are introduced in some product categories and not in others, (ii) how the existence of a low-quality private label affects the pricing of a competing national brand, and (iii) how consumers’ surplus and welfare are affected by private labels. We find that the potential for private label introduction may—in return for national brand exclusivity in that particular retail store (exclusive dealing)—lead to price concessions from the producer of the national brand. If the national brand producer decides not to offer an exclusivity contract, a private label is introduced. In this case, private label introduction may lead to higher retail prices on national brands, which can be detrimental to consumer welfare as well as total welfare. We argue that our results have important implications for the interpretation of empirical results and the public policy towards national brands     

Buyer power and supplier incentives

This paper analyzes the origins and welfare consequences of buyer power. We show that if suppliers are capacity constrained or have strictly convex costs, there are two different channels through which large buyers can obtain more favorable terms from their suppliers. In particular, we show how the presence of large buyers can then erode the value of suppliers’ outside option. Somewhat surprisingly, we show how this can induce suppliers to undertake strategies that lead to higher output and potentially higher welfare.