This report reviews patterns in migration within the U.S. over the past thirty years. Internal migration has fallen noticeably since the 1980s, reversing increases from earlier in the century. The decline in migration has been widespread across demographic and socioeconomic groups, as well as for moves of all distances. Although a convincing explanation for the secular decline in migration remains elusive and requires further research, the authors find only limited roles for the housing market contraction and the economic recession in reducing migration recently. Despite its downward trend, migration within the U.S. remains higher than that within most other developed countries. Charts and tables. This is a print on demand report.

Up-to-date and comprehensive, this book is an integration of the biological, cultural and historical dimensions of population movement.

This book is Open Access under a CC BY license. This volume offers an essential resource for economic policymakers as well as students of development economics focusing on the interrelationships of migration, urbanization and poverty in Asia. The continent’s recent demographic transitions and rural-urban structural transformations are extraordinary, and involve complexities that require in-depth study. The chapters within this volume examine those complexities using a range of traditional and non-traditional measures, such as multidimensional poverty, gaps and polarization, to arrive at the conclusion that poverty is now an urban issue. In short, the book will help students of development economics and policymakers understand the interrelationships between internal migration, urbanization and poverty, paving the way for the improved management of internal migration and disadvantaged and vulnerable populations.

"South-South Migration and Remittances" reports on preliminary results from an ongoing effort to improve data on bilateral migration stocks. It sets out some working hypotheses on the determinants and socioeconomic implications of South-South migration. Contrary to popular perception that migration is mostly a South-North phenomenon, South-South migration is large. Available data from national censuses suggest that nearly half of the migrants from developing countries reside in other developing countries. Almost 80 percent of South-South migration takes place between countries with contiguous borders. Estimates of South-South remittances range from 9 to 30 percent of developing countries' remittance receipts in 2005. Although the impact of South-South migration on the income of migrants and natives is smaller than for South-North migration, small increases in income can have substantial welfare implications for the poor. The costs of South-South remittances are even higher than those of North-South remittances. These findings suggest that policymakers should pay attention to the complex challenges that developing countries face not only as countries of origin, but also as countries of destination.

It is estimated that nearly one in seven people — more than 1 billion in total — are classified as migrants in national statistics. Of these, about 763 million are estimated to be internal migrants; the remaining 281 million are international migrants (International Organization for Migration 2021). Migration is an intrinsic part of the development process, representing one of the greatest opportunities to facilitate economic and social advancement in developing countries. Understanding how different types of individuals and households perceive these opportunities and overcome related constraints, and how these change over time, is of key interest. At the same time, migration presents one of the world’s biggest challenges, requiring adjustments by both sending and hosting communities, and understanding those adjustments is a priority. The CGIAR Research Program on Policies, Institutions, and Markets (PIM) has undertaken more than 40 studies designed to explore the causes and consequences of internal and international migration. In aggregate, the studies help us understand what motivates people to migrate and what factors impinge on their ability to do so. These studies focused on the relationship of migration with rural transformation, gender, youth, climate change, and social protection and cut across the whole PIM research portfolio. This brief synthesizes findings from this research in an attempt to present a more complete picture. While there is a vast literature on migration external to PIM and CGIAR, the results of the PIM investiga­tions constitute valuable inputs into national pol­icies and programs designed to foster economic and social development while maximizing the benefits and reducing the risks of migration.

"The migration of labor from rural to urban areas is an important part of the urbanization process in developing countries. Even though it has been the focus of abundant research over the past five decades, some key policy questions have not found clear answers yet. To what extent is internal migration a desirable phenomenon and under what circumstances? Should governments intervene and, if so, with what types of interventions? What should be their policy objectives? To shed light on these important issues, the authors survey the existing theoretical models and their conflicting policy implications and discuss the policies that may be justified based on recent relevant empirical studies. A key limitation is that much of the empirical literature does not provide structural tests of the theoretical models, but only provides partial findings that can support or invalidate intuitions and in that sense, support or invalidate the policy implications of the models. The authors' broad assessment of the literature is that migration can be beneficial or at least be turned into a beneficial phenomenon so that in general migration restrictions are not desirable. They also identify some data issues and research topics which merit further investigation. "--World Bank web site.