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PubMed1992

Urbanisation, poverty and employment: the large metropolis in the third world.

"The main purpose of this paper is to provide an overall review of the chief analytical as well as economic policy issues in relation to Third World cities in the light of the available theoretical and empirical studies on urbanisation, poverty and employment in the developing countries.... Part I...provides basic information on urbanisation in the Third World...[and] outlines the nature and extent of urban poverty in these large cities and considers the impact of the world economic crisis on the urban poor. Part II of the paper discusses the most important structural features of urbanisation in relation to economic development....Finally, Part III briefly examines policy issues in relation to urbanisation and poverty in the Third World's large cities."

Demography↗
PubMed1998

Urbanization patterns: European versus less developed countries.

This paper develops a model in which the interaction between transport costs, increasing returns to scale, and labor migration across sectors and regions creates a tendency for urban agglomeration. Demand from rural areas favors urban dispersion. European urbanization took place mainly in the 19th century, with higher costs of spatial interaction, weaker economies of scale, and a less-elastic supply of labor to the urban sector than in less developed countries (LDCs) today. These factors could help explain why primate cities dominate in LDCs, whereas a comparatively small share of urban population lives in Europe's largest cities.

Demography↗
PubMed1994

Associations between social and environmental factors and perinatal mortality in Jamaica.

Social and environmental factors in Jamaica were compared between 9919 mothers delivering in a 2-month period a singleton who survived the early neonatal period and 1847 mothers who were delivered of a singleton perinatal death in a contiguous 12-month period. Logistic regression showed independent positive statistically significant increased odds of having a perinatal death among mothers who lived in rural parishes, older mothers (aged 30 +), single parents, no other children in the household, large number of adults in the household, mother unemployed, the major wage earner of the household not being in a managerial, professional or skilled non-manual occupation, the household not having sole use of toilet facilities, smaller mothers and those classified as obese or undernourished. Variations were found for different categories of death. Intrapartum asphyxia deaths were not related to union (marital) status, occupation of major wage earner, number of adults nor to the use of the toilet. Antepartum fetal deaths did not vary significantly with occupation of major wage earner or maternal height, but did show a relationship with maternal education, mothers with lowest levels having reduced risk. Deaths from immaturity were significantly related only to occupation of major wage earner, number of children in the household, number of social amenities available (negative relationships) and maternal age (< 17 at highest risk). In conclusion there was little to indicate that social deprivation per se was related to perinatal death, although specific features of the environment showed strong relationships.

Adolescent↗
PubMed1981

Public policy and residential mobility in Dutch cities.

"The role of government policy in the housing market is examined for its impact on residential mobility in medium-sized Dutch cities. Mobility rates for these cities are regressed against in-migration rates, age and family composition variables, housing stock characteristics and measures of policy. There is little relationship between in-migration and intra-urban movement. After controlling for demographic and housing stock characteristics, the policy measures (the provision of subsidies for new construction and renewal subsidies) do explain a significant proportion of the variation in mobility rates across cities." It is also found that "when the cities are grouped by mobility rate, the policy measures account for important proportions of the variance in two of the three groups of cities. For the other group of cities housing stock characteristics are important explanatory variables."

Demography↗
PubMed1986

John Turner revisited: an intra-urban migration model for colonial-type cities in Latin America.

The author uses the intra-urban migration model developed by John Turner in the early 1960s to examine population movements in the city of Arequipa, Peru. Ways in which the model applies in the case of Arequipa are summarized, as are quantitative and qualitative differences between the model and the Arequipa study. The Turner model employs economic (industrialization level), demographic (level of rural-to-urban migration), and political (housing policy) criteria to distinguish a city's transitional phase. "According to these criteria Arequipa clearly belongs to the mid-transitional phase. The pattern of intra-urban migration, however, shows a mixture of Turner's mid and late transitional phases (e.g. center acts still as a reception area, but at the same time a major number of migrants settle directly in the periphery).... The town itself has a limited industrial development and hardly any municipal housing policy worth mentioning.... It is above all the demographic factor in combination with the town's morphology (a large colonial-type center, etc.) which in the case of Arequipa regulates the pattern of intra-urban migration."

Americas↗
PubMed1987

A dynamic phase transition model for spatial agglomeration processes.

A nonlinear model of population migration is presented in order to provide a dynamic explanation for the formation of metropolitan areas. "In Section 2 the model is introduced in terms of the rate equations for the mean values of the regional population numbers with specifically chosen individual transition rates. Section 3 gives a survey of concepts and results for the convenience of the reader not interested in the details of the mathematical derivations. Section 4 derives the stationary solutions of the rate equations, that is, the equilibria of the system. Section 5 treats the time dependent solutions of the model equations focussing on the exact analytic solutions along so-called symmetry paths. Section 6 analyzes the dynamic stability of the symmetry path solutions and decides which stationary states are unstable and which are stable equilibrium states."

Demography↗
PubMed1988

Incorporating the effects of spatial structure in discrete choice models of migration.

Discrete-choice theory and logit models are evaluated for their usefulness in analyzing migration patterns in a zonal system. The authors "argue that spatial effects and more specifically the relative location of zones are not taken into account in such analyses. We, therefore, introduce a measure of spatial structure and advocate its usage as a predictor of migration in such models. In an example of intrametropolitan migration in Toronto [Canada], we demonstrate that this variable is not only significant but also it improves the performance of all the other variables with the greatest impact on the distance between zones. In addition, inclusion of this variable improves the overall performance of the model in terms of residuals."

Americas↗
PubMed1982

The factors of urban population growth: net inmigration versus natural increase.

"As a country evolves from a traditional to an advanced society, the part of urban growth that is due to net inmigration follows a simple pattern, which can be described by an inverted U-shaped curve: it first increases, then passes through a maximum, and decreases thereafter. This hypothesis is confirmed by quantitative analysis using time-series and cross-section data. The analysis suggests that in the second half of this century natural increase often provides a slightly higher contribution to urban population growth than net inmigration." (summary in FRE, ITA, JPN, )

Demography↗
PubMed1986

A model of urbanization with nonlinear migration flows.

"This paper seeks an appropriate specification of the migration exchange between rural and urban areas so that the implied evolution of the degree of urbanization agrees with its commonly observed S-shape. After demonstrating that the gross migration flows between rural and urban areas should be specified as nonlinear functions of the population in the origin sector, the paper introduces a model in which such flows are represented by gravity-type functional forms....[The model] can be used to give insights into the time paths of three basic urbanization variables: the urban-rural growth rate differential, the rural net outmigration rate, and the urban net immigration rate. All take on a zero value at the two extremes of the urbanization process and evolve in between according to a bell-shaped curve. These findings are illustrated by applying the model to data from the United States for the period 1790-1980."

Americas↗
PubMed1988

The reversal of the migration turnaround: resumption of traditional trends?

"Cochrane and Vining's study of recent trends in core-periphery migration, while suffering from some weaknesses in methodology and interpretation, confirms very clearly that the reversal of the metropolitan migration turnaround is a widespread phenomenon in the developed non-Communist world. Evidence from the United Kingdom also supports this observation. An examination of the possible factors responsible for the rise and fall of counterurbanization over the past two decades suggests that two major forces--population deconcentration and regional restructuring--are operating simultaneously but relatively independently and that they both fluctuate in their nature and strength over time in response to prevailing demographic and economic circumstances."

Demography↗