农业自然资源与食物生产的类型迭置分析—以福建省为例

福建省粮食缺口逐年拉大,其它副食品也出现程度不同的短缺信号。在食物短缺的背后隐含着农业自然资源数量的短缺,并且随着人口的增长而日益严重。本文从农业自然资源与食物生产的内在联系入手,尝试对其丰乏程度进行定量的地域划分和迭置分析,进而探索各地域类型的食物发展方向与总体对策。     

The micro-foundations of intertemporal price discrimination

Summary. This paper investigates the optimality of intertemporal price discrimination for a durable-good monopoly in a model where infinitely-lived households face an intertemporal budget constraint, and consume both durable goods and non-durable goods. We prove that the optimal price of the durable good is not constant, and may decrease or increase over time. Some households may choose to purchase the durable good at a later date, and pay lower or higher prices, since the gain in discounted utility of consuming more of the non-durable good more than compensates for the loss in utility from delaying the consumption of the durable good.Received: 12 March 2004, Revised: 7 January 2005, JEL Classification Numbers: D40, D42, D91.I would like to thank C.D. Aliprantis, the Editor, and an anonymous referee for their generous advice, and constructive comments and suggestions. I have also enjoyed discussions with John Quah on the subject. Research support from the Wharton-SMU Research Centre, Singapore Management University, is gratefully acknowledged.     

略论新疆资源开发和生态环境保护问题

本文针对新疆自然生态系统和自然资源的特点及开发利用中存在的问题，提出了合理开发利用的途径。     

县域主导产业选择研究

要发展好县域经济必须重视其主导产业的选择。阐述了县域经济主导产业选择必须注意的原则,建立了相关的评价指标,运用了熵值计算方法对县域经济的主导产业进行了实证分析。     

Does Increased Extraction of Natural Gas Reduce Carbon Emissions?

Without an international climate agreement, extraction of more natural gas could reduce emissions of CO₂ as more clean natural gas may drive out dirty coal and oil. Using a computable equilibrium model for the Western European electricity and natural gas markets, we examine whether increased extraction of natural gas in Norway reduces global emissions of CO₂. We find that both in the short run and in the long run total emissions are reduced if the additional quantity of natural gas is used in gas power production in Norway. If instead the additional quantity is exported directly, total emissions increase both in the short run and in the long run. However, if modest CO₂-taxes are imposed, increased extraction of natural gas will reduce CO₂ emissions also when the additional natural gas is exported directed.earlier version of this paper was presented at the 25th Annual IAEE International Conference in Aberdeen June 2002.     

知识型服务业国际转移趋势与中国承接对策

近年来,以美国为代表的发达国家知识型服务业向具有智力人才优势的新兴市场国家转移的新浪潮正在兴起,标志着经济全球化进入了新的发展阶段.目前我国知识型服务业基本上还处于发展的起步阶段,但同时也存在着巨大的发展潜力,面临着承接国外转移的良好机遇.当前要站在国家产业发展的战略高度来充分认识承接知识型服务业国际转移的重要性和迫切性,并采取积极有效措施来迎接这轮新的全球产业布局调整.     

知识经济与城市产业空间布局的调整

随着网络等高新技术的飞速发展，世界经济正在从工业经济向知识经济转变，阻碍生产素流动的控制壁垒和自然壁垒明显减少，产业空间区位选择的灵活性大在增强，产业布局将出现分散与聚集共存的趋势，那些以创新为基础的知识密集型产业将形成有规律的集群，大城市中心区也将日益成为跨国公司总部以及银行，保险，管理咨询等生产才高度集中的地区，成为协调全国仍至全球生产的信息和服务中心，根据产业空间演变化的新趋势和我国城市产业布局的现状，作者提出了我国城市产业空间布局的方向和思路。     

西方国家文化产业的就业特点

自"世界文化政策大会"召开20余年来,文化产业发展大潮已席卷大多数西方国家.根据西方学者的相关研究,西方国家文化产业就业主要呈现以下七个特点:巨大的就业量、较快的就业增速、主要分布在都市区、分布倾向于发达大城市、各地域具有不同的优势部门、产业结构中"生产"功能增长显著、生产活动中中小型企业处支配地位.结合我国的实际状况,西方国家文化产业就业可以给我国如下启示:就业应成为文化产业发展的指示器;文化产业不是绝对的支柱产业;要扶持优势产业以促进城市竞争力;农村地区可以适当发展文化产业;文化产业不等同于高新技术产业;注重对小企业的扶持.     

RECENT DEVELOPMENTS IN THE THEORY OF NATURAL MONOPOLY

Abstract. This paper examines two important recent developments in the theory of natural monopoly, or more generally the theory of market structure. The first is a series of papers, involving Baumol with various co-authors, investigating the theory of industry structure, whilst the second is particularly associated with the names of Shaked and Sutton, and the relationship they develop between product differentiation and industry structure. The paper surveys and to some extent contrasts these two new approaches.
Baumol et al. 's contribution is seen to be in the area of clarifying the concept of natural monopoly, refining the definitions of multiproduct costs, and developing a notion of social efficiency applicable to industries where economies of scale are important. Shaked and Sutton employ a new definition of natural monopoly unrelated to market size and utilize information about consumers'income distributions to develop their notion of vertical product differentiation and natural oligopoly.     

土地垄断供给、纵向市场关系与房地产价格——兼论基于价值链分析的房地产市场竞争促进政策

地价与房价之间并不仅仅是一种成本联系.土地市场与房地产产品市场之间还存在着纵向市场关系,在两个市场均为寡头垄断的情况下,则会存在着双重垄断加成的现象.与上下游产业之间的市场交易关系相比,垂直一体化和垂直约束同样是组织住房生产的有效方式,并有助于增加消费者剩余.此外,促进房地产开发价值链上各环节的竞争,消除其垄断行为,将是降低房价和增进居民福利的重要选择.