TIPPING AND RESIDENTIAL SEGREGATION: A UNIFIED SCHELLING MODEL*

ABSTRACT This paper presents a Schelling‐type checkerboard model of residential segregation formulated as a spatial game. It shows that although every agent prefers to live in a mixed‐race neighborhood, complete segregation is observed almost all of the time. A concept of tipping is rigorously defined, which is crucial for understanding the dynamics of segregation. Complete segregation emerges and persists in the checkerboard model precisely because tipping is less likely to occur to such residential patterns. Agent‐based simulations are used to illustrate how an integrated residential area is tipped into complete segregation and why this process is irreversible. This model incorporates insights from Schelling's two classical models of segregation (the checkerboard model and the neighborhood tipping model) and puts them on a rigorous footing. It helps us better understand the persistence of residential segregation in urban America.     

广州市外来人口居住隔离及影响因素研究

利用广州市人口普查街道(部分居委会)数据总结1990-2000年外来人口居住隔离的时空特征:隔离程度呈增加趋势,核心和外围区隔离程度及变化差异大,散点状为主的空间模式,并呈现异质性和非稳定性的社会特征。通过典型社区问卷访谈,对比外来人口与户籍低收入人口,建构影响因素的逻辑回归(Logistic regression)模型,显示户籍的属地差别是产生隔离的根本原因,与户籍属地管理相关的劳动力市场分割和住房政策共同构成了排斥的制度环境,限制了外来人口的住房选择,把其推向低端私人租房市场。在有限的居住选择下,交通和经济等个体择居要素影响了隔离空间的分布和社会特征,以城中村为代表低端私人租房来源的布局特征决定并固化了隔离空间的分布模式。     

SOCIAL UPGRADING IN SIX CANADIAN INNER CITIES

This paper examines social upgrading in the inner neighbourhoods of six major Canadian cities between 1971 and 1981. The extent of social status change is assessed, and hypotheses are considered to account for neighbourhoods likely to experience social upgrading. Maps of status change are discussed and suggest further general principles. These are assessed in a correlation analysis where the dependent variable is an index of social status change for each inner city tract. Most of the independent variables show significant associations; the most consistent correlation is with proximity to an existing elite area. Implications of these findings for models of neighbourhood transition are considered.
Cet article examine le phénomène du renouveau social à I'intérieur des secteurs d'habitation de six grandes villes canadiennes entre 1971 et 1981. Le changement de statut social fait I'objet d'une évaluation dans son étendue, et des hypothèses sont formulées pour rendre compte des quartiers qui ont de grandes chances de connaître un phénomène de renouveau social. La carto-graphie des changements de statut social permet de dé-gagerde nouveaux éléments d'explication. La vérification des hypothèses est faite au moyen d'une analyse corrélative où la variable dépendante est un in-dice du changement de statut social survenu en chaque division des secteurs couverts. La plupart des variables indépendantes montrent des associations significatives; la corrélation la plus marquée a rapport à la proximité d'un secteur où réside l'élite. La signification de ces ré-sultats pour la formulation de modéles de quartiers en transition retient notre attention.     

REPRODUCING AND RESHAPING ETHNIC RESIDENTIAL SEGREGATION IN STOCKHOLM: THE ROLE OF SELECTIVE MIGRATION MOVES

This paper deals with the issues of selective migration moves, and the production and reproduction of immigrantdense neighbourhoods in Stockholm, Sweden. It has been shown earlier that selective migration, that is, socioeconomic and ethnic differences between those leaving, entering and staying in so‐called deprived neighbourhoods, reproduces these neighbourhoods' characteristics of being poor and immigrant dense. Key concepts launched to inform such studies and derived from the US segregation discourse are “white fight” and “white avoidance”, meaning that native people (or white people in the US case) tend to leave neighbourhoods experiencing growing numbers of immigrants (black people) and which they also tend to avoid moving into such neighbourhoods. Using a complete set of geo‐coded longitudinal individual data for the 2005–2008 Stockholm County population, this paper contributes to our understanding of ethnic differences in the intra‐urban migration system. Three empirical questions are addressed: what individual characteristics distinguish (1) those who move into neighbourhoods experiencing rapidly increasing immigrant densities from those moving elsewhere in the urban region; (2) those who leave neighbourhoods experiencing rapidly increasing immigrant densities from those who stay put; (3) those who move in the direction of higher immigrant densities from those moving into lower densities? Results from multivariate statistical analyses provide support for the avoidance hypothesis but less support for the fight hypothesis. When controlling for a range of individual and neighbourhood attributes there is clear evidence that native‐born Swedes are less inclined than most immigrant categories to move into immigrant dense areas while ethnic origin does not seem to matter much when explaining who leaves such areas.     

ANALYSING THE VINLAND MAP: A CRITICAL REVIEW OF A CRITICAL REVIEW*

In an attempt to validate the Vinland Map as a genuine15th century work, Garman Harbottle (2008 ) claims to review critically, and thereby discredit, the archaeometric research undertaken on the Map's ink by Walter McCrone (1974–1999) and Brown and Clark (2002 ). In this paper we outline and discuss the numerous arguments that are presented by Harbottle, all of which we find to be misleading or at best highly questionable.     

"后社会主义城市"社会空间分异研究述评

社会空间的分化与极化是当代城市空间结构的主要特征。经济转型伴随了社会分异程度的增加,带来新的社会空间结构。对于中国城市社会空间转型的研究正处于方兴未艾之际,但对于处于东欧和前苏联的所谓“后社会主义城市”(Post-socialistCities)的研究尚缺乏比较与借鉴。本文通过对“后社会主义城市”社会空间分异研究的综述,探讨了这一类城市在新的政治经济背景下新的社会极化对城市社会空间的影响,市场的出现和福利体系的重构造成了普遍的社会空间分异程度的增加,这类转型城市的社会空间表现出多元多样的空间分异格局。     

VARIATIONS IN EMPLOYMENT AND NON-EMPLOYMENT INCOME IN CANADIAN CITIES AS INDICATORS OF ECONOMIC BASE DIFFERENCES

The use of personal income sources instead of labour force as an indicator of urban economic base differences offers another perspective on the character of cities. This analysis discovered that cities were becoming less dependent on income from employment, thereby downgrading the effectiveness of labour force as an economic base indicator, and more dependent on income from investments and pensions. Significant variations in income sources were revealed both by region and by size of city. In general, the smaller the city, the higher the proportion of income from pension-government sources, and the larger the city, the higher the proportion from investments.
L'utilisation des sources de revenu personnel au lieu de celles de la main-d'oeuvre comme indicateur des differences de base économique urbaine offre une autre perspective sur le caractere des villes. I1 a étéétabli que les villes deviennent de moins en moins dependantes des revenus provenant des emplois, déclassant ainsi I'efficacité de la main-d'oeuvre en tant qu'indicateur de base econornique, et de plus en plus dbpendantes des revenus provenant d'investissements et de pensions. Des variations significatives ont été mises en évidence dans les sources de revenu par rapport à la région et à la taille d'une ville. En règle générale, plus la ville est petite plus la proportion du revenu provenant des pensions du gouvernement est élevée, et plus la ville estgrandeplus la proportion du revenu provenant d'investissements est élevée.     

西方国家城市人口迁居研究进展综述

西方国家城市人口迁居研究可以分为三个阶段。60年代中以前,从人类生态的角度出发,研究人的社会地位、家庭状况、经济收入对人口迁居的影响。60年代中至70年代中,从数量分析、行为分析的角度出发,研究迁居的空间特征、数量模式、迁居行为、住房链。70年代中至现在,从社会结构深层角度来研究迁居,并对绅士化现象作了全面研究。     

国外城市涂鸦研究进展与启示

城市涂鸦自1960年代在世界各大城市普及以来,在环境指示、社会沟通、权力表达、身份构建、产业发展、规划设计等诸多方面扮演着重要角色,并成为一种典型且有争议的城市社会文化现象,吸引了国外学者的密切关注。借助文献计量分析法,以Web of Science为数据库,对国外城市涂鸦研究进行了系统分析,并重点回顾了涂鸦的内涵、涂鸦与城市环境、涂鸦的街头表达、涂鸦与空间构建、涂鸦与城市响应等主要领域的研究进展,同时从研究内容、学科、方法与数据、理论基础四个方面进行了述评与展望。最后,分析了国外涂鸦研究对我国研究的启示,从我国涂鸦的诞生背景、涂鸦者群体和涂鸦特征三个方面阐述了我国涂鸦研究对国际研究可能存在的意义,也指出了未来我国涂鸦研究的方向。     

美国城市示范运动及其启示研究

在当代世界各国的城市化进程中,城市的更新改造和发展以及相关问题和矛盾的解决都是要面临的重要课题。示范城市运动是美国大规模城市更新运动的重要阶段,也是轰轰烈烈的"伟大社会"改革中后期重要的战略转移。本文选取该项运动为研究主题,回顾了其发生背景、发展过程,分析了其正反两方面的经验,以期为中国在进入改革开放关键时期构建和谐社会进程中更好地解决城市问题提供一个有价值的参照。