Cities throughout the world – particularly global cities – are becoming increasingly heterogeneous as a result of international migration movements. During the past three decades, the influx of immigrants into metropolitan areas like New York, Los Angeles and San Francisco has increased demand for housing, exacerbating the already tight housing markets in these cities. This article focuses on the spatial distribution and housing conditions of immigrants in San Francisco using primarily the 2000 US census data on population and housing down to the census tract level. Building on past research on ethnic enclaves and communities, this article applies spatial analysis methods to identify clusters where Chinese, Filipino and Mexican households – the largest foreign‐born groups in San Francisco – live. The article argues that different immigrant groups show distinct spatial clustering patterns and that there are significant variations in housing outcomes for immigrants within and outside of ethnic clusters. These differences are largely in the direction predicted by the spatial assimilation theory. However, findings such as the high incidence of homeownership within Chinese and Filipino clusters suggest that contemporary immigrants do not necessarily view ethnic clusters as transitory. These findings help to confirm other recent studies showing that immigrants are now spatially clustered in ways that may no longer fit theoretical models derived from the settlement patterns of late nineteenth‐century immigrants. The article contributes to literature concerned with ethnic clusters in US inner cities and the housing conditions of immigrants in global cities. A travers le monde, les villes, surtout les villes planétaires, sont de plus en plus hétérogènes à cause des mouvements migratoires internationaux. Au cours des trois dernières décennies, l'afflux de migrants vers les zones métropolitaines comme New York, Los Angeles et San Francisco a accru la demande de logements, resserrant les marchés déjàétroits dans ces grandes villes. L'article s'attache à la répartition spatiale et aux conditions de logement des immigrants à San Francisco à partir, essentiellement, de données provenant du recensement américain 2000 sur la population et l'habitat par régions sociales. S'inspirant de recherches antérieures sur les communautés et enclaves ethniques, l'étude applique les méthodes d'analyse spatiale pour identifier les regroupements de foyers chinois, philippins et mexicains (groupes d'étrangers les plus nombreux à San Francisco). Les différents groupes d'immigrants présentent des modèles d'agrégation spatiale distincts et leur logement varie considérablement selon que les populations se trouvent dans ou hors des regroupements ethniques. Ces divergences traduisent largement l'orientation prévue par la théorie de l'assimilation spatiale. Toutefois, des résultats tels que le poids de l'accession à la propriété dans les groupes chinois et philippins suggèrent que les immigrants actuels ne jugent pas forcément ces regroupements ethniqu...

Informal institutional arrangements, permeating both formal and informal housing settlements, allow markets to function in developing countries. Yet their economic, social and policy impacts are largely unexamined. Insights from the new institutional economics literature are used to show the significance of informal institutional arrangements in credit, land markets and infrastructure delivery. The analysis is grounded in the experience of Trinidad and Tobago, with empirical information drawn from fieldwork research done in 1993 and 1997. Research findings show that informal institutions of cooperation (e.g. sou‐sou, CBOs) support transactions by reducing transaction costs, by lowering risk and by providing mechanisms to cope with uncertainty. They are therefore used instead of formal institutions. Policy‐makers should expect intense utilization of such locally designed institutions that use social capital in the process of land and housing market reform in developing countries. Ce sont les arrangements institutionnels informels, organisent l'habitat officiel et officieux, qui donnent aux marchés la possibilité de fonctionner dans les pays en voie de développement. Néanmoins leur impact économique, social et politique n'ont généralement pas été examinés. J'utilise des outils provenant des travaux sur l'économie neo‐institutionaliste pour démontrer la signification des arrangements institutionnels officieux pour le crédit, les marchés agraires et la distribution des infrastructures. L'analyse est basée sur l'expérience de Trinidad et Tobago, et l'information empirique provient d'une recherche de terrain faite entre 1993 et 1997. Les résultats montrent que les institutions officieuses de coopération (par exemple sou‐sou, CBOs) supportent les transactions en réduisant leurs coûts, en abaissant les risques, et en fournissant des mécanismes pour faire face à l'incertitude. Elles sont donc utilisées à la place des institutions officielles. Les politiciens peuvent s'attendre à une utilisation intense de telles institutions désignées localement et qui utilisent le capital social dans le processus de réformes du marché agraire et du logement dans les pays en voie de développement.

Institutional and regulatory environments have a profound impact on land markets and prices. This paper argues that affordability of land and housing ownership in less developed countries is largely affected by cumbersome land transfer processes and an uncertain building permit approval process. It examines the impact of these constraints on land markets and affordability in Trinidad. By using Dowall's land market assessment methodology, the paper examines land price changes and land conversion patterns in the East-West Corridor region of Trinidad between 1989 and 1993. While prices of fully registered and serviced land have remained stable during this period (unlike many cases of 'skyrocketing' land prices reported in the literature), an examination of institutional and regulatory constraints suggests that land prices are likely to increase in the future when demand conditions become more favourable. These constraints have certainly played a significant role in the expansion of unauthorised housing settlements as documented by household survey results.

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This paper highlights the economic and policy significance of informal institutional arrangements (ignored in past research) governing housing transactions citywide that permeate both formal and informal sectors, blurring the conventional formal/informal distinction. It documents the convergence in formal and informal housing markets in Turkey by focusing on the "build and sell system," an institutional arrangement between land owners and small scale contractors/ entrepreneurs governing multistory housing construction. Other informalization trends in formal subdivisions such as noncompliance with building codes (induced by amnesty laws), and formalization trends in gecekondu settlements such as commercialization and densification (accelerated by municipal regularization programs and land pressures) depict the convergence.