农业产业集群作用于农村市场体系的机理初探

农业产业集群是凭借农业资源优势,在农村地域范围内,由农户、农业加工企业、流通企业等竞合而形成的一种产业集聚组织,是农业产业化发展的一种有效模式,它的培育与发展对于农村市场体系结构的健全与功能的完善有着不可估量的作用。为此从农村市场体系内部结构的健全和功能效果的发挥两方面探讨农业产业集群对其的作用机理,并参考陕西韩城花椒产业集群的发展,从集群的角度为培育富有生机和活力的农村市场提供政策建议。     

重庆金融业产业集群的现实基础:一个实证研究

构建长江上游地区金融中心对重庆未来的发展起着关键的促进作用,而金融中心的一个重要特征是金融业产业集群的形成。重庆在向长江上游金融中心发展过程中,市场自发演进形成的经济基础、金融业相关的产业政策和区域性经济发展战略是构建重庆金融业产业集群最重要的现实基础。实证表明:过去20年来,政策因素对重庆金融业产业的影响作用力超过经济因素,外贸对金融的影响力不显著。     

基于动力机制的我国产业集群发展研究

产业集群动力机制是获取持续竞争优势和推动我国产业集群发展的根本力量,其包含内源动力机制和外源动力机制。内源动力机制将产业集群中包含的本地根植性蕴涵丰富的要素（资源）转化为内生优势;外源动力机制分为政府行为、外部竞争环境等,其作用带来产业集群的外部优势。以产业集群动力机制及其作用规律研究为基础,产业集群内部治理与集群政策相结合的“从下到上”思路,是有利于我国产业集群发展的新模式。     

产业集群与信息化

当代世界经济发展正在出现一种引人关注的空间模式,有人称之为产业集聚或产业集群,而构成产业集群的系统的基本要素是物质与信息。在集群中产业之间能量传递和交换的物质流与信息流是相互依存的,但两者在产业关联中的作用方向正好相左。由于数字和网络技术的飞速发展所带来的是信息和它的实物载体的分离。信息流的地位和作用迅速提高,使集群中的产业关联基础发生了从物质流为主向信息流为主导的根本性转变。     

我国环保产业研究现状及尚需探讨的几个问题

本文在总结目前我国环保产业研究现状的基础上,认为中国环保产业的要想得到理论研究的指导,就不能回避对几个问题进行深入的探讨,即当前我国环保产业内涵的界定;环保产业的价值和评价体系;我国环保产业发展的特有规律;中国加入WTO对我国的环保产业的影响。     

对产业生态化理论的思考

本文首先对产业生态化的历史渊源作了简要回顾;接着在指出“生态工业园区”概念不足的基础上,具体阐述了产业生态化的本质特征;全程生态化;而后介绍了沱牌生态园基本状况,并深入探讨了沱牌集团酿酒产业生态化实施细节;最后是政策建议。     

刍议我国木材工业发展与生态保护

分析了我国木材工业的社会需求及其林木资源状况,指出依靠科技进步,实现木材资源的高效利用,是缓解我国木材供需矛盾、保护森林资源、维护生态平均、实现木材工业可持续发展的必由之路。     

A Probabilistic Clustering Model for Variables of Mixed Type

This paper develops a probabilistic clustering model for mixeddata. The model allows analysis of variables of mixed type: thevariables may be nominal, ordinal and/or quantitative. The modelcontains the well-known models of latent class analysis as submodels.As in latent class analysis, local independence of the variables isassumed. The parameters of the model are estimated by the EMalgorithm. Test statistics and goodness-of-fit measures are proposedfor model selection. Two artificial data sets show the usefulness ofthese tests. An empirical example completes the presentation.     

福建省水产业二十年改革与发展

改革开放２０年来,福建省水产业有了突飞猛进的发展。主要经验：一是解放思想、开拓思路;二是改革渔业经济体制;三是实施科教兴渔;四是扩大国际交流与合作;五是加强法制建设     

Market share instability and stock price volatility during the industry life-cycle: the US automobile industry

Market share instability, during certain stages of the industry life-cycle, has become a stylized fact in the industrial organization literature. In the finance literature, volatility in the form of excess volatility, i.e. the much larger volatility of stock prices than dividends (although stock prices should in theory trace the present value of future dividends), has given rise to controversies regarding stock price determination (Campbell and Shiller, 1988; Shiller, 1989). Recent evolutionary models, both theoretical and empirical, have tied the presence of market share instability to industry specific variables, such as specific periods in the industry life-cycle and specific “technological regimes”. The object of the paper is to explore whether there is a relationship between market share instability and stock price volatility and to what degree this relationship is connected to the concept of the industry life-cycle, and hence to industry specific factors. To do so, we explore the relationship in one particular industry, the US automobile industry. Since neither life-cycle nor finance theories attack this problem directly, we use insights from both approaches to build hypotheses which guide the data analysis. The empirical results confirm many of these hypotheses, suggesting that the degree of excess volatility is indeed partly affected by industry specific factors.