期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2009
卷号：106
期号：34
页码：14236-14240
DOI：10.1073/pnas.0901898106
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：When a new facility like a grocery store, a school, or a fire station is planned, its location should ideally be determined by the necessities of people who live nearby. Empirically, it has been found that there exists a positive correlation between facility and population densities. In the present work, we investigate the ideal relation between the population and the facility densities within the framework of an economic mechanism governing microdynamics. In previous studies based on the global optimization of facility positions in minimizing the overall travel distance between people and facilities, it was shown that the density of facility D and that of population {rho} should follow a simple power law D [~] {rho}2/3. In our empirical analysis, on the other hand, the power-law exponent {alpha} in D [~] {rho}{alpha} is not a fixed value but spreads in a broad range depending on facility types. To explain this discrepancy in {alpha
关键词：optimal positioning ; social opportunity cost ; microdynamics model
