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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 CM oo CM ifi CM q costs of migration crude birth rate crude death rate decrease demand for children demographic transition destination area developing countries distance variable Easterlin Economic History equation European immigration examined Family Planning farmland farms fertility model fertility rates fertility regulation Gallaway and Vedder gravity-type model human capital in-migration income independent variables internal migration maximum rural population Model 0 Model Morton Owen Schapiro natural increase Nebraska nineteenth century northern United number of births number of children oi CM CM oo oo oo out-migration partial equilibrium period population density proportion of reproductive proxy q TP rate of natural ratio reproductive females rural areas Rural Crude Birth rural-urban migration settlement model South Dakota Table tion Williams College Yasuba