Stability and Segregation in Group Formation

This paper presents a model of group formation based on the assumption that individuals prefer to associate with people similar to them. It is shown that, in general, if the number of groups that can be formed is bounded, then a stable partition of the society into groups may not exist. (A partition is defined as stable if none of the individuals would prefer be in a different group than the one he is in.) However, if individuals' characteristics are one-dimensional, then a stable partition always exists. We give sufficient conditions for stable partitions to be segregating (in the sense that, for example, low-characteristic individuals are in one group and high-characteristic ones are in another) and Pareto efficient. In addition, we propose a dynamic model of individual myopic behavior describing the evolution of group formation to an eventual stable, segregating, and Pareto efficient partition. Journal of Economic Literature Classification Numbers: C72, H41.     

Environmental protection versus economic growth

This paper presents and analyses the differences in the eco-models implemented worldwide （such as whether and how carbon taxes being ＂recycled＂）, or in their efficiency parameters （inconsistent parameter values that account for different results）. This is the assumption that a real tradeoff exists between the production of environmental goods. The present article empirically proves that something must be given up in order to gain something else, and once equations are specified to trace out the path of the economy over time, the natural economic formulation of such equations will embody the notion of economic and bio-tradeoffs.     

中国财政性教育投资的实证分析与对策研究

在现代市场经济社会里 ,几乎所有国家的政府投资在为全社会提供教育服务方面都起着主导作用。我国财政性教育投资严重不足 ,而且教育投资结构很不合理 ,因此必须改变教育投资观念 ,切实、稳定增加财政的教育投资 ,优化财政教育投资结构     

Reviewing Oates' insights in a repeated game setting

This paper analyzes the optimal assignment of public good policies to layers of a federal system in a repeated game setting. Under a centralized regime, public goods are financed jointly across regions, and a federal legislature decides on the regional quantities. Under a decentralized regime, public goods are financed locally, and governments play a non-cooperative provision game. We find that a centralized (decentralized) regime is more likely to provide the efficient public good policies in case spillovers are small (large). Received: September 2003, Accepted: October 2004 JEL Classification: H11, H41 I wish to thank Clemens Fuest, Anke Kessler, Christoph Lülfesmann, and an anonymous referee for valuable comments on this paper. Financial support by the DFG (SPP 1142) is gratefully acknowledged.     

物流中的新设施—自动化立体仓库

当今物流速度日益加快，仓库建设和改造向空间、立体化、自动化快速发展，建设自动化立体仓库是今后的必然趋势。结合多年实践．对物流领域成件货物储存的新设施，自动化立体仓库进行了详细阐述。     

我国第三方物流发展现状及趋势

传统的物流企业大多是自己建仓库，办车队，万事不求人的同时大大增加了成本。专家们提出，物流企业发展应该走专业化道路，第三方物流企业在中国已经崭露头角，并且显示出强大的生命力。本文介绍了第三方物流的含义及产生原因，指出了第三方物流的作用，并且分析了预测了国内第三方物流的发展现状及未来走向，本文认为，第三方物流前景看好。     

Public goods provision: Unit-by-unit cost-sharing rules and the core

In a simple model of one public good producible from one input, we show that unit-by-unit cost-sharing rules have two properties. First, a unit-by-unit cost-sharing rulealways chooses a core allocation. Second, every allocation in the core will be chosen by at least one unit-by-unit cost-shring rule. We argue that costs should be shared on a unit-by-unit basis. We propose a simple mechanism to implement the family of unit-by-unit rules. Received: 18 May 2005, Accepted: 6 December 2005 JEL Classification: H41, C72, D78 I thank Hervé Moulin for helpful comments and discussions. All errors are mine. Financial support from the Hong Kong Research Grants Council under grant RGC-DAG99/00.BM52 is gratefully acknowledged.     

积极发展我国对外服务贸易——基于规避货物贸易争端的视角

加入WTO五年来,我国经济持续快速增长,很大程度得益于我国对外贸易的强劲增长.2005年我国货物进出口总额达到14221亿美元而使中国成为世界第三贸易大国,但贸易摩擦也急剧上升.随着中国经济结构的转换,有效规避不断升级的货物贸易争端,积极发展对外服务贸易必将作为我国未来对外贸易的突破口和主力军.     

信用的二重性探究

人类最初产生的信用 ,是包含在公道和友谊之中的信用 ,后来才产生借贷这种经济学意义上的信用。信用同时具有伦理品性和经济品性双重属性。现代信用既具有私人物品的竞争性、排他性 ,又具有一般公共物品的非竞争性、非排他性特征 ,还具有一般公共物品所不具备的无形化及以社会道德为基础等特殊性。信用作为公共物品仍是经济品性和伦理品性的同构体     

我国农村公共产品供给的制度困境及对策选择

农村公共产品供给效率低下是我国三农问题中的一个长期症结，这既体现了公共产品供给的一般问题，也反映了我国农村公共产品供给的特殊矛盾。本从供给制度的角度剖析了我国农村公共产品供给的困境，并初步探讨了相应的配套改革措施。