A NOTE ON NEIGHBORHOOD SIZE AND THE MEASUREMENT OF SEGREGATION INDICES*

This note examines neighborhood segregation measures with respect to size and validity. Conventional measures, while related to within-neighborhood homogeneity, are not necessarily related to neighborhood size. An empirical test examines racial segregation for Baltimore in 1970 and 1980 using both census tract and specially formulated neighborhood aggregates. For both years, and for all measures of segregation, the values and trends are essentially unchanged by the level of aggregation.     

A NOTE ON THE LOCATION OF MEDICAL FACILITIES

In this note, I present a method to estimate the desired distance between medical facilities. The survival rate of patients improves when the facility is larger, however larger facilities result in a longer driving distance to the facility which decreases the survival rate. I identify the desired distance between facilities for which the survival rate is maximized.     

IMPACT OF ENVIRONMENTAL PROTECTION MEASURES ON THE U.S. ECONOMY

A rapid deterioration in the quality of the environment in the United States has compelled the Government to take a series of actions, including the enactment of remedial legislation. However, the environmental protection measures taken have begun to markedly influence the country's economy, resulting in redistribution of some industries, e.g., the coal mining industry, and in a reduction in the output of some products, for example, a decline in lead production due to the use of nonleaded gasoline. The problems of environmental protection are not purely natural-scientific or technological, but also socio-economic and, hence, class problems. In a capitalist society, environmental protection measures have to be implemented under conditions of sharp conflict between a public value, such as the environment, and private ownership of the means of production, which pollute that environment. (The paper is based largely on materials gathered by the author during a stay of nearly six months in 1974–75 at the University of Illinois. The translation is by R. Bruce Wood, University of Illinois, Urbana.)     

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.     

基于“推—拉”理论的美国旅游者旅华流动影响因素研究

"推—拉"理论是研究人口流动的一种基础理论,可以有效地解释游客流动。本文从推—拉理论的视角,运用因子分析、单因素方差分析和皮尔逊相关分析等方法对美国来华旅游者的流动影响因素进行研究,得到的主要结论有:(1)明确了美国来华旅游者推力维度和拉力维度的各个因子;(2)检测了推拉维度的各因子受社会人口统计学变量的影响;(3)测度了推拉维度各因子之间的相互关联性及影响因素。研究成果对指导我国针对主要入境旅游客源国进行的产品开发和市场营销具有一定的实践价值,同时也拓展了对影响旅游流流动各因素之间关系研究的范畴。