物流信息系统对物流现代化影响的探讨

阐述了现代物流与传统物流的区别,分析服务和信息技术对现代物流的作用,研究提高物流信息系统性能的途径,提出了物流技术新概念。     

Existence of a competitive equilibrium in a one sector growth model with heterogeneous agents and irreversible investment

Summary. We prove existence of a competitive equilibrium in a version of a Ramsey (one sector) model in which agents are heterogeneous and gross investment is constrained to be non negative. We do so by converting the infinite-dimensional fixed point problem stated in terms of prices and commodities into a finite-dimensional Negishi problem involving individual weights in a social value function. This method allows us to obtain detailed results concerning the properties of competitive equilibria. Because of the simplicity of the techniques utilized our approach is amenable to be adapted by practitioners in analogous problems often studied in macroeconomics. Received: September 13, 2001; revised version: December 9, 2002 RID="*" ID="*" We are grateful to Tapan Mitra for pointing out errors as well as making very valuable suggestions. Thanks are due to Raouf Boucekkine and Jorge Duran for additional helpful discussions. We also thank an anonymous referee for his/her helpful comments. The second author acknowledges the financial support of the Belgian Ministry of Scientific Research (Grant ARC 99/04-235 “Growth and incentive design”) and of the Belgian Federal Goverment (Grant PAI P5/10, “Equilibrium theory and optimization for public policy and industry regulation”). Correspondence to: C. Le Van     

Price–Cost Margins and Structural Change: Sub-Contracting within the Salmon Marketing Chain

Some recent studies have benefited from advances in time series econometrics in order to evaluate price transmission mechanisms along the marketing chain. Due to the length of time series, structural changes may affect the evaluation of price–cost margins. In the case of the fresh salmon trade between Norway and France, the gross margin between producers and retailers has changed in level between January 1988 and December 1999. This article accurately identifies the date of a structural change using a range of recent ADF testing procedures (Gregory–Hansen tests, forward and backward recursive tests), before looking for the causes of the change through a survey. Two major factors can be identified: the product form and the marketing channel. Interestingly, both the increasing level of processing and the development of supermarket chains have resulted in a new role for the intermediaries, shifting from mere commercial intermediation to sub‐contracting for the big retailers.     

浅谈现代电子商务对物流的影响

本文主要讨论电子商务的概念和特征,物流的概念,以及我国传统商务下物流发展现状及现代电子商务对物流的各种影响.     

一种项目采购模式的博弈分析

本文试图用经济学理论 (主要是博弈与信息经济学的理论 )来分析目前工程项目建设中采用的一种工程设备、材料的采购模式。文章首先提出这种模式的内容与特征 ,然后就制度内各参与方 (主要为业主、承包商、供货商 )之间的博弈进行分析 ,分不完全信息博弈、完全信息博弈两种情况来分析这种采购制度下达到的均衡。     

基于博弈论的二层供应链网络竞争与结盟模型

就两个制造商和一个零售商所组成的供应链模型进行研究,运用博弈论方法来研究制造商间的竞争及制造商与零售商间的竞争和协调决策问题,给出了两种决策下相应的数学模型,并比较了制造商与零售商间有无联盟关系时对各自收益的影响。     

立式双面研磨机变形机理探讨

文章通过对立式双面研磨机运动机理分析,探讨了研磨盘产生伞状变形原因,提出如何针对实际情况消除变形,提高加工精度。     

论贸易技术壁垒的性质及其经济效应

贸易技术壁垒本身具有针对性和隐蔽性强、一定的合法性以及影响面广等特点，使得贸易技术壁垒成为国际贸易中使用最广泛、效果最显著的非关税壁垒措施之一。无可争辩的事实是：有些贸易技术壁垒措施具有合理性，也为国际贸易发展创造了新的机遇，但也有一些贸易技术壁垒措施从科学技术、卫生、检疫、安全、环保、产品质量和认证等方面入手，披上合法外衣，灵活多变，使得国外厂商难以应付，实际上已经成为推行新贸易保护主义的手段，从而影响着各国经济政策的制定，因而也就直接或间接地制约着国际贸易的发展速度，并在一定程度上影响着国际贸易的商品结构、地理方向，引起不同国家间、集团问的贸易摩擦和冲突。     

转基因食品标签与消费偏好——以南京市超市食用油实际销售数据为例

强制性标签政策可能对转基因产品的消费和贸易产生很大影响，其程度主要取决于消费者对转基因产品的接受程度，以及转基因标签对消费者态度和行为的影响。本研究利用超市实际销售数据分析转基因食用油强制标签政策的实施是否影响消费者的购买行为，发现标签政策实施后转基因食用油的市场份额下降，下降幅度虽然不大但统计学上显著。     

促进城乡和谐发展的理念与理据

城乡差距过大是构建和谐社会的障碍,必须通过"反哺三农"的方式缩小城乡差距,实现城乡间的社会公平与协调发展.从历史贡献补偿角度而言,国民经济应对工业化初期以"剪刀差"方式吸纳的"三农"资金予以补偿;从社会福利角度来说,国民经济的发展不应牺牲涉农主体的利益,政府应对低工资、低地价、农产品低价格予以利益保障或补偿;从社会公正角度而言,政府应保障处于弱势地位的涉农群体的基本权益;从博弈均衡的角度而言,社会公共财政应承担起农村公共品的供给责任.