The Location Invariance Theorem in Weberian Space Under Uncertainty

This paper examines the validity of the location invariance theorem in Weberian space under various types of uncertainty. The main results are: Given that the firm's location is constrained to remain at a specified distance from the output market, the optimal location is invariant to any change in product demand if and only if the production function is homothetic for a firm facing demand price uncertainty, or if the production function is homothetic and both inputs are risk-neutral for a firm facing technological uncertainty. Alternatively, given that the distance from the firm's location to the output market is a variable, location invariance occurs for a firm facing demand price uncertainty if the production function is linear homogeneous. In the presence of input price uncertainty the optimal location always varies with a change in product demand. The results can include those previously obtained for linear stochastic location models as special cases and some are new contributions to the literature.     

On the Logit Approach to Competitive Facility Location

The random utility model in competitive facility location is one approach for estimating the market share captured by a retail facility in a competitive environment. However, it requires extensive computational effort for finding the optimal location for a new facility because its objective function is based on a k -dimensional integral. In this paper we show that the random utility model can be approximated by a logit model. The proportion of the buying power at a demand point that is attracted to the new facility can be approximated by a logit function of the distance to it. This approximation demonstrates that using the logit function of the distance for estimating the market share is theoretically founded in the random utility model. A simplified random utility model is defined and approximated by a logit function. An iterative Weiszfeld-type algorithm is designed to find the best location for a new facility using the logit model. Computational experiments show that the logit approximation yields a good location solution to the random utility model.     

上海大都市区物联网产业集聚与空间演化

新兴技术产业的空间集聚与扩散对大都市区的空间结构有直接的影响,厘清新兴技术产业的空间分布和区位选择规律对新兴产业集群培育和大都市区空间结构调整都具有重要的政策意义。本文分析了上海市物联网企业的空间分布和集聚特征,结果发现初创期物联网企业在郊区集聚,随后向郊区其他区域扩散,并呈现出从单极向多极集聚转变的空间演化进程。通过构建负二项回归探究上海物联网企业的区位选择因素,结果表明制度因素和企业集聚效应对企业区位选择有重要影响。在产业发展初创期,企业区位选择受政府管制和市场机制双重影响,其中制度因素发挥了关键作用;而在随后的兴起期,产业集聚效应对新企业的入驻具有强大的吸引力。     

THE JOURNEY-TO-WORK DISTANCE IN RELATION TO THE SOCIO-ECONOMIC CHARACTERISTICS OF WORKERS

The aim of this paper has been to explore the variation in the distance between the residence and work locations of industrial workers. This distance has been theoretically and empirically related to the income, number of dependents, marital status, sex, and age of workers whose job site was located in the centre of the city. A multiple regression model has shown the over-all importance of the budget constraint as a factor in the residential location decision relative to the job site. Of the variables included in the analysis, the wage rate of the worker is the strongest determinant of the location decision. Although workers who have the same budget constraint show weak locational relationships with the job site relative to the number of dependents and marital status, as suggested by the model, the only strong difference in spatial location occurs when the budget constraint is allowed to vary. Once workers have the means to increase their over-all utility level, they do trade off journey-to-work disutilities for residential facilities farther from the central city job site. But the social conditions of the worker tend to influence the residence-to-work distance only slightly when considered apart from the influence they may have on the wage rate. The over-all dependence of the journey-to-work distance on these variables in this setting hence was small, reaching an R value of only 0.38.     

Surviving in a Competitive Spatial Market: The Threshold Capture Model

Many facility location decision models ignore the fact that for a facility to survive it needs a minimum demand level to cover costs. In this paper we present a decision model for a firm that wishes to enter a spatial market where there are several competitors already located. This market is such that for each outlet there is a demand threshold level that has to be achieved in order to survive. The firm wishes to know where to locate its outlets so as to maximize its market share taking into account the threshold level. It may happen that due to this new entrance, some competitors will not be able to meet the threshold and therefore will disappear. A formulation is presented together with a heuristic solution method and computational experience.     

THE EFFECTS OF ZONING IN SPATIAL COMPETITION

ABSTRACT This paper considers a location model to illustrate the effect of zoning on competition. A planner is in charge of designing a city in a circular space where firms and consumers are located on different sides. With this type of market configuration, equilibrium in location under concave transport costs is proved. Then, a welfare function with different weights attached to consumer and firm surpluses is introduced to highlight zoning regulation as an influential competition policy tool. Depending on the regulator's political profiles and the demand, it is shown that zoning can lead to strong, weak, or moderate competition.     

OPTIMALITY OF RECYCLING AND THE LOCATION OF A RECYCLING CENTER

ABSTRACT. Consider a community investigating the integration of recycling into its waste management program. Even if (1) the county's citizens do not gain utility from recycling, (2) landfill space is plentiful, and (3) the market price for recyclables is zero, recycling can still be optimal for a local government. By determining the relationship between the amount of recycling and the location of a recycling center, conditions are identified under which recycling will reduce total waste management costs enough that municipal recycling will be optimal. In addition, it is shown that the likelihood of municipal recycling increases with the size of the city.     

COMPETITIVE FACILITIES: MARKET SHARE AND LOCATION WITH RANDOM UTILITY*

ABSTRACT. A new approach is proposed for calculating the expected market share. It is assumed that consumers patronize a facility according to a utility function, selecting the facility with the highest utility value. However, consumers'ratings of the utility components are stochastic by some random distribution. Therefore, the buying power of customers located at the same point is divided among several facilities. A probability that a consumer patronizes a certain facility can be calculated. Consequently, the expected market share by competing facilities can be estimated. This calculation is more than 1,000 times faster than repeating a simulation enough times to achieve a reasonable accuracy. The distance decay calculated using the new approach is approximately exponential. A procedure for finding the optimal location anywhere in the plane for a new facility that maximizes the market share is also introduced.     

高速铁路对中国城市产业结构的影响研究

交通是影响城市产业发展的重要因素,高铁作为一种新型交通工具必将对城市产业发展产生影响。修正市场潜力模型分析高铁对中国城市产业结构的影响。结果表明：①总体上,高铁提升了城市服务业的比重,降低了城市制造业的比重;制造业型城市和服务业型城市的服务业比重都得到提升,制造业比重都下降;从单个城市来看,高铁提升了大多数制造业型城市和大多数服务业型城市服务业的比重。②对于制造业型城市的产业结构升级,高铁主要促进该类城市一般服务业比重的提升;对于服务业型城市的产业结构强化,高铁主要促进这些城市高端服务业比重的提升。③高铁的开通增强了中心城市的溢出效应,促进了中心城市及其周边城市的产业结构升级。     

Competitive Location and Pricing on Networks

In this paper we consider a location and pricing model for a retail firm that wants to enter a spatial market tvhere a competitor firm is already operating as a monopoly with several outlets. The entering firm seeks to determine the optimal uniform mill price and its servers' locations that maximize profits given the reaction in price of the competitor firm to its entrance. A tabu search procedure is presented to solve the model together with computational experience and an example.     

Competitive Location and Pricing on Networks

In this paper we consider a location and pricing model for a retail firm that wants to enter a spatial market where a competitor firm is already operating as a monopoly with several outlets. The entering firm seeks to determine the optimal uniform mill price and its servers' locations that maximize profits given the reaction in price of the competitor firm to its entrance. A tabu search procedure is presented to solve the model together with computational experience and an example.     

AUTOMOBILE USE AND LOCATIONAL INTERDEPENDENCIES

ABSTRACT. Congestion and pollution externalities from automobile use are simultaneously included in an urban monocentric model. The externalities enter household utility functions directly, and result in a complex interdependency in household location decisions in the city. Implications of the model are drawn out by a simulation and complete sensitivity analysis. The two unpriced externalities are examined for their impact on urban structure, and contrasted with each other. Also, the effect of changes in speed of travel are examined for the impact on urban structure. Speed affects the level of both external effects, and is affected by location decisions.     

OPTIMUM LOCATION AND THEORY OF THE FIRM UNDER A REGULATORY CONSTRAINT*

This paper attempts to incorporate space in the theory of a regulated firm. It will show that the A-J effects are not affected in a spatial setting. In addition, it will also demonstrate that as the difference between the regulated fair rate of return and the unconstrained profit-maximizing rate of return on capital becomes greater, the optimum location of the regulated firm moves towards the site of the product market, if capital and labor are complements (substitutes) and if marginal transportation costs (with respect to distance) are an increasing (decreasing) function of labor usage.     

互联网技术应用对零售业空间组织影响研究进展

互联网技术应用对零售业空间组织的影响已成为当今学术界研究热点。本文利用文献资料法和对比分析法,梳理了国内外互联网技术应用对零售业空间组织结构、零售企业区位选择与布局、市场空间等方面的影响研究,并提出了未来人文地理学须进一步强化的研究内容。结果表明：20世纪90年代中期以来,互联网技术应用对零售业空间组织影响的研究成果日益丰富,且涉及到经济地理学和商业学等学科,研究方法主要以定性为主,且定量研究日益增多,但对互联网技术应用对传统零售业区位选择和销售腹地的影响、中小网络零售企业空间组织、运输距离对网络零售企业销售空间影响以及出口跨境网络零售企业销售空间格局等方面研究还需完善,未来研究应注重吸收其他学科理论和方法,强化实证研究结论的科学性。     

GENERAL EQUILIBRIUM OF SPATIAL PRODUCT AND LABOR MARKETS*

ABSTRACT A simple general equilibrium model relates spatial product markets and spatial labor markets. The firm is treated as being a spatial monopolist or as a Löschian competitor in the output market and as a spatial monopsonist in the labor market. Derived free spatial demand and free regional labor supply are defined, and their properties examined. The model provides the framework for analyzing the impact of a technological improvement in labor productivity on the structure of the spatial markets. The impact of entry on spatial labor supply is an important determinant of whether or not entry lowers wages and raises output prices. Unlike the spaceless competitive paradigm, zero-profit long-run equilibrium can occur in a space economy under conditions of increasing returns to scale.     

城市内部不同所有制制造业区位时空演变研究——以无锡为例

制造业发展及其区位演变是中国近30年来城乡空间发展的主要动力,不同所有制制造业区位变迁是解读经济体制改革作用于城乡空间发展机制的重要视角。基于1985、2004、2013年制造业企业数据,运用空间分析技术及计量模型,探讨无锡不同所有制制造业区位演变规律及其体制动因。结果表明:无锡制造业空间从以中心城区为主的"单中心"格局向以郊区为主的"多中心"格局演进,表现出显著的郊区化和空间不均衡特征,其中土地有偿使用的市场力量和各类开发区设立的行政引导是重要驱动机制,而区位通达性因素的影响相对较弱;不同所有制制造业的区位演变呈现出差异化的体制响应特征。本研究对无锡的产业布局优化和城乡规划具有重要参考意义。     

A NOTE ON TRANSPORTATION RATES AND LOCATION OF THE FIRM IN A TWO-DIMENSION,n-INPUT SPACE*

This paper examines the theoretical implications of quantity-discounted transportation rates on the optimum location decision of the firm. It shows that the linearly homogeneous or homothetic production function is not a sufficient condition for the independence between the optimum location and the output level, unless (i) the elasticities of transportation rates with respect to quantity shipped are constant and identical, and (ii) the ratios of marginal products 60 the marginal transportation costs are equal for each input.     

城市住宅的生态区位探析

在评析传统的住宅经济区位论的基础上,文章提出了居住环境的生态价值对住宅区位的重要意义,进而从经济因素和环境因素两个角度提出了城市住宅的生态区位模型。并以上海市为例分析了环境生态价值对商品住宅价格的影响,以及对未来住宅区位的几点启示。     

A HARMONIZATION OF FIRST AND SECOND NATURES*

ABSTRACT This paper investigates the joint impact of the first nature and the second nature forces on industry location. Toward this aim, we develop a two‐region new economic geography model where local factor congestion and location advantages compete with demand linkages and product market crowding. In particular, we study the case of absolute location advantage in a single industry model and the case of comparative advantages in a two‐industry model. We characterize the structure of industries and discuss the possibilities of catastrophic changes, endogenous industrial asymmetries and specialization. We find that absolute location advantage are associated with a smooth agglomeration process and comparative advantages with a catastrophic process.     

城市流动摊贩的微区位选择机制——基于广州市200个摊贩访谈的实证研究

流动摊贩对缓解城市失业和贫困问题发挥了重要作用。以广州为例,运用GIS空间分析和半结构式访谈的方法,研究了摊贩的空间分布特征与摊贩区位因子的微观作用机制。摊贩在不同空间尺度呈现集聚分布,在不同时间尺度呈现有规律的数量变化。摊贩的区位选择主要受市场因素作用,但同时受到住地与摆卖地之间的距离、政府管制、外部相关利益主体(商户、公共场所管理者、居民)的干预以及摊贩之间的竞争与合作的微妙影响,结果不是市场最大化原则下的最优区位,而是合理的区位。强调市场因素的内涵不仅包括人流量,还包括消费者的消费能力和需求。摊贩区位选择没有偏离现代区位论的思想,其区位决策是经济与非经济因素共同作用的结果。