集成的零售配送区域划分和运输计划模型研究

零售配送是直接面向广大消费者具有配送对象不断变化特点的配送服务。集成的零售配送区域划分和运输计划模型融合了零售配送生成成本最小路径矩阵、配送区域划分、生成运输计划的全过程。它以GIS道路网数据为基础。以时间为成本，考虑时间窗口约束、道路双向交通、商品混运和运输工具重复调度等因素，自动地生成以线路为基础的运输计划，为配送企业提供了自动化决策的方法。     

产业升级、贸易政策与经济转型

产业升级是经济转型的内驱动力，贸易政策对于产业升级具有制约作用，是经济转型的外驱力量。政府通过设计合理的激励机制，将两种力量聚合，积极推动经济转型，从而缩短经济转型的时间进程。     

我国A股、B股市场并轨的前景探析

B股市场的前途问题是一个困扰市场参与者的主要问题,而前途的不明朗源于B股市场定位的困惑和功能失调。筹资功能方面,1991～2004年12月B股市场通过股票发行总计筹资50.03亿美元,通过配股筹资3.27亿美元,而同期A股市场对应的数据是5695.7亿元和2276.74亿元,而且最近3年B股市场的     

杜钰洲指出:轻纺城促进了产业和流通业的双重的升广州国际轻纺城强势出击"中博会"

9月12～15日,广州国际轻纺城以近300平米的大规模展位,"航空母舰式"特装展台形象高调亮相在广州琶洲会展中心举行的"第二届中国中小企业博览会暨中法中小企业博览会"(简称"中博会").     

青年农民工市民化的制约因素分析

青年农民工市民化,是指他们在身份上获得城市居民相同的合法身份和社会权利的过程,最明显的标志是获得所在地的城市户口及相应的社会权利。但是在推进青年农民工市民化过程中,仍然存在着思想障碍、制度障碍、政策障碍、组织障碍、青年农民工自身素质障碍等方面的限制,制约了青年农民工市民化的顺利推进。     

对塔里木河流域灌区实施SIDD管理模式的思考

本文以产权理论和制度变迁理论为基础,将产权及制度变迁中的路径依赖思想运用于分析灌溉用水管理制度创新的问题中,通过介绍SIDD管理模式的实施效果以及体制障碍的分析,提出了进一步发展SIDD的制度环境建设的对策。     

西北地区的生态旅游与可持续发展

西北地区旅游业的发展应坚持可持续发展的生态旅游.因为西北地区发展生态旅游有着丰富的旅游资源和良好的市场前景。进入20世纪90年代尤其是1993年以来,全国旅游业发展迅猛,旅游市场走俏。国际市场稳步扩大,国际旅游外汇收入由1986年的世界第20位,上升到1997年的第9位,接待人数     

养老基金筹集模式的实证分析

当前的养老制度改革是关注的焦点。本文首先将从介绍现存的筹集模式入手,试图换个角度来思考在人口老龄化背景下的我国养老金基金制度,实证分析模式选择对于缴费率等的影响,并基于此,讨论未来改革的方向。     

Do homeowners achieve more household wealth in the long run?

Despite the public’s faith in homeownership as a vehicle for wealth creation, there are surprisingly few empirical studies of the independent impact of homeownership and its duration on household wealth accumulation. This paper provides the first empirical evidence that homeownership, after controlling for other drivers of wealth accumulation, is positively and significantly associated with wealth accumulation over time. Using the Panel Survey of Income Dynamics, it examines the influence of housing tenure choices between 1989 and 2001 on household net wealth levels in 2001 after controlling for initial wealth in 1989, location, income, education, and other family and personal characteristics that might influence the rate of wealth accumulation. Importantly, the models used also control for the tendency of households to accumulate wealth between 1984 and 1989 (five years prior to the studied period). This approach is used to address the possibility that an unobserved variable—the propensity to save or accumulate wealth—may be associated with both the probability and duration of homeownership and the rate of wealth accumulation. All else equal, those who owned homes and owned for longer periods of time had significantly higher household net wealth by 2001. These results are compelling because house price appreciation over the period was near its long-run average while stock gains were above and real rent increases below their long-run averages. Hence, the findings are suggestive of a positive influence of ownership over long periods on net wealth, even during a period when alternative investments produced higher than normal returns and rents grew slowly. This is especially important because the overwhelmingly majority of households do not sell their homes shortly after buying them. In our sample, those who became owners typically owned for 7 years. Furthermore, most households that bought during a period of declining real home values in the early 1990s continued to own their homes for at least eight years and came out well ahead of those who did not own.     

CEV模型的单位根检验研究

CEV模型（Constant Elasticity of Variance Model）作为常用的利率模型，在实证分析中得到了广泛运用，但是其单位根检验一直被忽略或者被默认可以使用迪基一富勒检验。本文首次运用Box—Cox变换的技巧，针对CEV模型的单位根检验问题，找到了合适的统计量并且证明其渐进分布存在，然后通过蒙特卡罗方法求出了该统计量的分布表。得到了在大样本的情形下可以沿用迪基一富勒检验，但在小样本的情形下与迪基一富勒检验有所偏差的结论。