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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/967 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/967 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/967 archive 351 disk0/00/00/09/40 2016-01-15 01:45:22 2021-08-27 17:09:00 2016-01-15 01:45:22 monograph show 2 Ledent J. AL0224 pub iis_mig iis_pop iis_urb iis_mod prog_hss This paper is the second of a series intended to shed some light on the urbanization phenomenon. Its main purpose is to contrast the results provided by two alternative models--the model proposed by Keyfitz (1978) and the continuous version of the multiregional model of population growth and distribution developed by Rogers (1968)--under constant regimes of natural increase and migration. In both cases, the evolution of the magnitude of urbanization as well as that of the relative importance of natural increase and migration in accounting for urban growth are examined. A particular emphasis is placed on the time spans necessary to reach two cross-over points| the point at which natural increase starts exceeding in-migration in the urban region (cross-over point of type I) and the point at which the urban population becomes larger than the rural population (cross-over point of type II). The contrast between the alternative models is illustrated with the help of an application to two actual rural-urban population systems presenting polar characteristics| those of the USSR and India. 1978-11 published RM-78-057 RM-78-057 10 2102 public research_memorandum IIASA, Laxenburg, Austria 58 FALSE info:eu-repo/semantics/book