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The Theory of Fertility
A Fertility Model
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23 Northern analysis availability of land available land bequest motive birth rate estimates birth rate predictions census changes Chapter CM CM 00 CM CM CM CM iri costs of migration crude birth rate crude death rate decline in rural decrease demand for children demographic transition destination area developing countries distance variable Easterlin Economic History equation European immigration examined Family Planning farmland farms fertility and migration fertility model fertility rates fertility regulation Gallaway and Vedder gravity-type model in-migration income independent variables internal migration maximum rural population Model 1 Model Morton Owen Schapiro natural increase Nebraska nineteenth century northern United number of births number of children out-migration partial equilibrium period population density population pressure proportion of reproductive proxy q CM rate of natural ratio reducing regional affinity regression procedure reproductive females rural areas Rural Crude Birth Rural Pop rural-urban migration settled settlement model South Dakota Table tion versus Model Yasuba