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, )
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D003710:Demography; D004641:Emigration and Immigration; D005843:Geography; D011153:Population; D011154:Population Characteristics; D011157:Population Dynamics; D011158:Population Growth; D014505:Urban Population; D014507:Urbanization
Demographic Factors; Geographic Factors; Migration; Natural Increase; Population; Population Characteristics; Population Dynamics; Population Growth; Rural-urban Migration; Spatial Distribution; Urban Population; Urban Spatial Distribution; Urbanization; World