An Econometric Estimation of Industrial Water Demand in France

This study investigates the structure of industrial water demand byestimating the derived demand for water on a sample of industrialestablishments located in the south-west of France. Productiontechnologies are represented by short-term variable cost functions andapproximated by a translog form. Industrial water use is modeled ashaving three components: the quantity of water bought to a waterutility, the quantity of autonomous water and the quantity of watertreated prior to use. We include in this framework water effluents,which are considered as a by-product of the production process, emittedby firms. Each of the three water components is treated as a separateinput and all are estimated as a system of simultaneous equations. Themodel is estimated on a sample of 51 industrial plants in the Girondedistrict observed from 1994 to 1996 using Seemingly Unrelated Regression(SUR) and Feasible Generalized Least Squares (FGLS). Results ofestimations show that industrial firms are sensitive to water priceinputs. Network water elasticity is estimated at –0.29. It variesfrom –0.10 to –0.79 according to the type of industryconsidered. Autonomous water price elasticity is not significant.Elasticity for treated water is evaluated at –1.42 at themean-sample and varies from –0.90 to –2.21 according to theindustry considered.     

民用建筑循环冷却水系统设计的探讨

文章对多年来在民用建筑循环冷却水系统设计、运行中碰到的一些问题,提出在设计时应注意的事项及所需要采取的措施。     

商业信息化与商业业态的演化

引入交易费用的概念解释商业业态的变迁，分析商业信息化条件下的各种交易方式的交易费用变化，以三种比较有前景的零售商业业态模式为例，分析其在新技术条件下的比较优势。     

Reduced Form Auctions Revisited

This note uses the Theorem of the Alternative to prove new results on the implementability of general, asymmetric auctions, and to provide simpler proofs of known results for symmetric auctions. The tradeoff is that type spaces are taken to be finite.     

Regulation of Mobile Telephony across the European Union: An Empirical Analysis

In this paper I analyze the impact of regulatory policy on prices and demand for mobile telecommunications services across the European Union. I estimate a reduced form model of the mobile industry using panel data for the EU countries from 1998 to 2002. Among others, I find the following effects: liberalization of fixed telephone lines has a negative impact on prices and a positive impact on the demand for mobile services, and the introduction of mobile number portability has a negative impact on prices.*I am grateful to Toker Doganoglu, Gerd Hansen, Eric Kodjo Ralph, Guido Friebel, participants at the 30th EARIE Conference 2003, the 2nd International Industrial Organization Conference 2004 and the 19th Annual Congress of the EEA 2004, and anonymous referees for valuable comments. I would like to acknowledge the generous financial support from the Volkswagen Stiftung and the Munich Graduate School of Economics which made this research possible. All errors are mine.1 Source: European Commission (1994).     

Trees and decisions

Summary. The traditional model of sequential decision making, for instance, in extensive form games, is a tree. Most texts define a tree as a connected directed graph without loops and a distinguished node, called the root. But an abstract graph is not a domain for decision theory. Decision theory perceives of acts as functions from states to consequences. Sequential decisions, accordingly, get conceptualized by mappings from sets of states to sets of consequences. Thus, the question arises whether a natural definition of a tree can be given, where nodes are sets of states. We show that, indeed, trees can be defined as specific collections of sets. Without loss of generality the elements of these sets can be interpreted as representing plays. Therefore, the elements can serve as states and consequences at the same time.Received: 23 January 2003, Revised: 2 November 2003, JEL Classification Numbers: C72, D70. Correspondence to: Klaus RitzbergerWe are grateful to Larry Blume, Ariel Rubinstein, Jörgen Weibull, an anonymous referee, and seminar participants at the universities of Vienna, Salamanca, and Heidelberg for helpful comments. Financial support from the Austrian Science Fund (FWF) under project P15281 is also gratefully acknowledged.     

略论循环农业中的生态学原理

日趋严重的环境问题使人们更加关注农业的命运，循环农业的兴起，使人类看到了农业持续发展的希望。本文从循环农业中的生活型选择、限制因子定律与耐受性定律、正相互作用、捕食作用、寄生关系、生化他感、群落时空格局构建、边缘效应、演替作用、物质循环再生、生态效率以及生物操纵等多角度探讨了生态学原理在循环农业中的应用。     

常州制造业循环经济建设研究

本文首先阐述了制造业循环经济建设的内涵,然后在分析常州市制造业增长付出的资源和环境代价的基础上,提出了常州市制造业循环经济建设的对策,即紧抓“减量化”原则,实现竞争理念和增长方式两个转变,并侧重清洁生产实施、工业园区整合和产业结构调整三个层面。     

博弈论在构建生态产业链中的应用分析

构建生态产业链的目的是为了实现废弃物的再生和循环利用,从而减少污染物的排放。本文运用博弈论方法,分析了上下游企业及政府部门在构建生态产业链问题上的不同利益动机及博弈行为。通过对博弈均衡结果的分析,得出了构建生态产业链,实现废弃物再生循环利用必须满足的条件。同时,博弈均衡的结果也为企业生态成本内部化提供了一定依据,并表明了政府部门加强监督管理的重要性。在此基础上,提出了相应的措施和建议。     

企业价值评估方法研究

企业价值评估诸多方法中,现金流指标的重要性日益显现,其中,自由现金流量最具可行性。企业规模 的大小、发展的阶段和经营的盈亏成为影响企业现金流的基本内因,而季节性、周期性和竞争是其外因。企业价值评 估从企业历史业绩分析开始,再预测未来绩效,并评估连续价值,最终确定企业价值总额。