| Summary: | "The magnitudes, nature, causes, and consequences of population movements between rural and urban sectors of developing countries are examined. The prior literature is reviewed, proving limited in key dimensions. Evidence is presented from a new database encompassing nationally representative data on seventy-five developing countries. Several measures of migration propensities are derived for the separate countries. The situation in each country is documented, both in historical context and following the time of enumeration. Rural-urban migrants enjoy major gains; those who do not move forego substantial, potential gains. Barriers to migrating are very real for disadvantaged groups. Migration among ethnolinguistic communities is a pervasive theme; the context in which each group lives is detailed. Upward mobility in incomes in towns is affirmed, and the departure of adults from rural homes raises living standards of the family left behind but consequent separation of married couples is endemic to particular societies. Reclassification of rural areas as urban is shown to be more important than net rural-urban moves in incremental urbanization and rural-urban moves are less permanent than normally portrayed. A contention of symmetry between rural-urban and urban-rural migration propensities is rejected and indications that these twin movements result in sorting of labor by skills is not supported. Moreover, step and onward migration are not as common as popularly claimed. Previously neglected topics studied include autonomous migration by women, child migration, and networks at origin. Policies to limit rural-urban migration are questioned, rather planning for managed urban growth is vital as climate change continues. Key words: Rural, urban, migration, development, literature, database, reclassification, sorting, policies"--
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