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1.
Cross‐docking replaces traditional warehousing, enabling continuous flow of items without storage. Here we model location‐distribution networks, that include cross‐docking facilities, to obtain the latter's impact on the supply chain. We formulate optimization models to minimize total cost in three multi‐echelon networks, each model generalizing the preceding one. The first includes a single manufacturer, one product type, and multiple customers. Cross‐docks are to be located between origin and destinations. Besides solving optimally, a tool for quantitative analysis of direct‐shipment decisions is developed. The second model considers more than one product: We determine a cost‐effective sequence of items for indirect shipment (via cross‐docks). Finally, in a network with multiple origins, optimal solutions are obtained for 40 medium‐sized and larger examples.  相似文献   
2.
In his 1960 book, Sraffa suggested using a composite commodity,which he called the ‘Standard commodity’, to solveRicardo's search for an invariable measure of value, i.e., astandard capable of isolating the price movements of any othercommodity induced by changes in income distribution. The absencein Sraffa's book of an explicit proof of the invariance propertyof this standard gave rise to many misunderstandings about itsmeaning and its role as an invariable measure of value. In orderto clear up these questions, Bellino (On Sraffa's Standard commodity,Cambridge Journal of Economics, vol. 28, 121–32, 2004)has proposed a ‘proper’ definition of an ‘invariablemeasure of value’, showing that Sraffa's Standard commoditydoes fulfil the requirements of this definition. He claims thatthe fulfilment of this property (but not the constancy of its‘nominal’ price) qualifies the Standard commodityas an invariable measure of value. In this paper, a proof ofthe invariance of the price of the Standard commodity with respectto changes in income distribution is given, and the equivalenceof this property with Bellino's definition of invariance isshown.  相似文献   
3.
We consider whether disaggregated data enhance the efficiency of aggregate employment forecasts. We find that incorporating spatial interaction into a disaggregated forecasting model lowers the out-of-sample mean squared error from a univariate aggregate model by 70% at a two-year horizon.  相似文献   
4.
This paper develops a model with distribution costs to study firm cooperation in forming strategic alliances and mergers, under different types of foreign market entry modes, that is, export or foreign direct investment (FDI). Under both export and FDI, we find that cross-border alliances (mergers) dominate domestic alliances (mergers); and cross-border alliances and mergers are preferred to independence if and only if distribution cost is high. Under export, cross-border alliances are chosen in equilibrium if distribution cost is high. Under FDI and with high distribution cost, cross-border alliances (mergers) are chosen in equilibrium if plant setup cost is low (high).  相似文献   
5.
    
Modern tools for cost-effective conservation reserve site planning require the planner to have information about spatial distributions of conservation costs and benefits. Climate change creates unprecedented uncertainty about future land values and species habitat ranges, such that conservation scientists cannot map costs and benefits with certainty anymore. This paper contributes to the literature on the economics of conservation in the face of climate change uncertainty. It advances a new method for using modern portfolio theory to choose lands to protect that yield total conservation returns with less uncertainty. It explores the implications for portfolio recommendations of variation in the correlations between ecological and land-value responses to climate change. It also tests the robustness of the method to shortcuts that might be taken to simplify analysis, identifying problems that arise if conservation costs are ignored in portfolio analysis and demonstrating when portfolio recommendations are sensitive to how ecological benefits are quantified.  相似文献   
6.
Voting referenda provide direct evidence of the demand for public goods. A number of previous studies have used referenda to analyze the support for public environmental goods. These studies have used aggregate data from large jurisdictional units (usually counties) and summary income measures such as the mean or median, and have usually found that higher income areas offer greater support for environmental propositions. We examine environmental referenda voting in California using census block group data, spatial dependence controls, and detailed income distribution data. We find that household income has a negative marginal effect on environmental referenda voting for most of the income range when using census block data. In addition, controls for spatial dependence significantly reduce the magnitude of most coefficients. This suggests that OLS estimates of referenda determinants are biased. We also show that county level data may be subject to severe aggregation bias and might not be appropriate for referenda studies.  相似文献   
7.
西部大开发战略的实施 ,为武汉这个中部特大中心城市的发展提供了机遇 ,如何顺势起飞 ,关键在于武汉中心城市功能的发挥。处于中部承东启西 ,九省通衢 ,基础强劲的武汉特大中心城市功能的发挥 ,也会有力地促进西部大开发战略的落实。武汉立足于其区位综合优势 ,从集散功能、生产功能、管理功能、服务功能、创新功能发展出发 ,借西部大开发之势重构和强化其金融商贸中心功能、交通枢纽功能、通讯信息中心功能、科技教育文化中心功能、生产和服务中心功能 ,是武汉发展和西部大开发的双赢策略。  相似文献   
8.
中国农村地区收入差距解释:1997~2005   总被引:5,自引:0,他引:5  
1997~2005年我国农村地区收入差距以2000年为转折点,经历了先下降后上升的变化过程。要素分解分析表明,1997~2000年地区收入差距的下降完全归因于分配效应;2001~2005年地区收入差距的上升主要归因于结构效应。样本分解分析表明,东中西部地区间的差距和东部地区内部的差距是形成农村地区差距的主要原因。费景汉-兰尼斯分解分析表明,工资性收入、地理位置、教育、物质资本和人均占有耕地面积共解释了地区收入差距的80%以上。  相似文献   
9.
We investigate trade and financial openness in a small developing country where entrepreneurs need bank financing to operate in an import‐competing sector but banks do not observe their ability. This informational asymmetry causes adverse selection of low‐ability individuals into entrepreneurship and also prevents poor but able individuals from being entrepreneurs. We find that trade opening improves national welfare, but a tax is needed on foreign financial capital. Trade opening reduces an income gap between the rich and the poor, while financial opening affects this income gap ambiguously.  相似文献   
10.
The objective of this article is to study the interactions that exist between public research and private research in the French biotechnology sector. These interactions are observable at a double level. On the one hand, public research can influence private research, and conversely. Researchers of these two spheres develop important relations of cooperation. We then seek to identify these mutual influences and to measure their spatial dimension. Using asymptotic least squares method, we show that spillovers can diffuse through cooperation in upstream and downstream phases of the innovation process. On the other hand, spillovers resulting from public or private research, when measured by an external stock of knowledge, would be located, in so far as they exist.  相似文献   
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