Revealed preference and differentiable demand

Summary. We prove that, for finitely many demand observations, the Strong Axiom of Revealed Preference tests not only the existence of a strictly concave, strictly monotone and continuous utility generator, but also one that generates an infinitely differentiable demand function. Our results extend those of previous related results (Matzkin and Richter, 1991; Chiappori and Rochet, 1987), yielding differentiable demand functions but without requiring differentiable utility functions.Received: 1 November 2001, Revised: 5 February 2004, JEL Classification Numbers: D11, D12. Correspondence to: Kam-Chau WongThis is a much revised version of Lee and Wong (2001). We are grateful to the Referee for valuable suggestions. We also thank Professor Marcel K. Richter for his comments.     

Timing of Public Information and Cost Reduction

Received July 31, 2000; revised version received July 18, 2001     

Ecological Transfers in Non-Human Communities Parallel Economic Markets in a General Equilibrium Ecosystem Model

Synopsis: The oft-cited analogies between ecological and economic systems are exploited to develop a many-species model of population dynamics. In economies, markets are the fundamental institutions in which the interaction of demands and supplies determine the quantities and prices of goods. However, economic markets are not appropriate for ecological communities, because markets rely on voluntary exchange, whereas plants and animals engage in involuntary transfers of biomass. A properly defined counterpart to markets based on biomass transfers permits a general equilibrium model of predator/prey and competitive interactions in a many-species community. Functional response from optimal foraging and predation risk provide the demand and supply, respectively, in the biomass transfers. Energy per unit time is scarce and predators and prey make optimum choices with respect to functional response and risk avoidance based on required energy expenditures. The energy expenditures are similar to economic prices: they determine foraging strategies and are beyond the control of the predators and prey, yet they are determined by the aggregate choices of all predators and prey and by population densities. The energies acquired from foraging are used in a new way to construct difference equations that determine the population dynamics. This revised version was published online in July 2006 with corrections to the Cover Date.     

Linking performance drivers in production planning and inventory control to process choice

This study investigates how process choice relates to production planning and inventory control decisions. We empirically examine the validity of deductively derived patterns about these types of decisions. More importantly, we look for normative insights by exploring how production planning and inventory control decisions affect operations performance. Our findings show that production line and continuous flow plants use more of a level production strategy, and carry less raw material and work-in-process inventory. The performance drivers for these plants, through which the operations function excels, are effective utilization of equipment, reduced finished goods inventory, and reduced setup down time. To gain forward demand visibility and batching economies, job and batch shops rely much more on backlogs in their planning process. These plants use more of a production chase strategy and position inventory lower in the bills of materials. Four performance drivers for top-performing job and batch shops are to find ways that better anticipate customers' orders, have a more responsive chase strategy, carry less raw material or purchased inventory, and shorten production planning horizon, partly through less reliance on backlogs. It is intriguing that top-performing plants not only do the expected things, given their choice of process, but also excel in selected dimensions—some of which fit the profile normally associated with a different process choice. To monitor and continuously improve operations, evaluation ‘scorecards’ should pay particular attention to performance drivers, which change depending on the plant's process choice.     

物流工程课程体系探讨

随着物流产业的快速发展，社会十分需要物流管理专业和物流工程专业本科人才。物流涉及的领域很多，有物流管理、物流系统规范、物流经济、物流信息化、物流机械、物流设施、物流自动化等。其中，物流管理专业主要偏重研究物流管理、物流系统规范、物流经济、物流信息化等领域，物流工程专业主要偏重研究物流系统规范、物流机械、物流设施、物流自动化等领域。本文根据社会需要，对物流工程人才培养的课程体系进行了探讨与研究。     

大股东资金占用与外部审计的公司治理职能

我国特殊的股权结构决定了我国上市公司的主要代理问题是大股东与中小股东之间的代理冲突。大股东往往通过各种方式如资金占用等来对上市公司进行掠夺。在西方成熟的资本市场上，审计作为一种独立的外部监督机制能够在一定程度上抑制代理冲突。那么在我国新兴的市场中，审计能否起到有效的监督作用从而抑制大股东的“利益输送行为”呢？本文从需求和供给两个方面进行了研究。实证结果发现，从需求方面来说，大股东资金占用越严重的公司越没有动机聘请高质量的审计师；从供给方面来说，审计师在出具审计报告时会考虑大股东的资金占用，大股东资金占用越严重，越有可能被出具非标准的审计意见报告。实证结果表明我国目前还不存在高质量的审计需求，但审计师能对大股乐的资金占用作出反应，从而在一定程度上抑制大股东的行为。     

农民工工资收入偏低分析——现实、宏观效应与原因

农民工工资收入长期处于一个较低的水平,然而,农民工对我国GDP及其增长做出了巨大的贡献。农民工对GDP增长的高贡献与其较低的工资收入水平导致了我国社会有效需求不足。农民工工资收入偏低的核心机制是古典产权制度下的工资市场定位。因此,要解决这个问题,必须进行相应的经济体制改革,构建和谐社会。     

论网络营销在我国的发展

随着Internet的迅猛发展,不仅人们的生活方式和思想观念发生了根本性的变革,也引起了营销方式、贸易形态和交易方式的巨大变化。网络营销以其压倒性的优势应运而生,并且一问世便引起了巨大的变革。它代表着21世纪市场营销的大趋势,正在成为网络经济中最热门、最活跃的活动之一,也是各国争先发展、各个产业部门最为关注的领域。它为企业掌握市场需求、开拓全新市场、参与国际竞争、减少中间环节、降低营销成本等提供了现代化的信息手段。文中着重探讨了什么是网络营销,如何认识网络营销,网络营销在我国的发展形势怎样,如何更好地开展网络营销。     

物流服务市场供求关系研究

从认识物流服务市场的供求现状出发,使用经济学理论、竞争理论、物流业固有特性三个分析方法进行物流服务市场供求关系研究,对揭示我国物流服务市场的运行规律有一定的引导作用。     

会计准则的供给与需求

会计信息是一种典型的公共物品,由于存在“市场失灵”、“政府失灵”,无法从根本上回答是政府制定会计准则还是由民间机构制定准则。从准则的供需角度出发,我国会计准则与美国以及国际会计准则的不同具有必然性,因为供给与需求不同,导致各国会计目标不完全相同。目标如不一致,所采用的会计政策与会计方法就会有侧重。