lunes, 31 de enero de 2011

Model of population cycle.






The model of demographic transition progresses in four stages:

-Old or preindustrial demographic regime: it is characterized by high mortality rates and birth rates.

-First transition: Keep the high birth rate, but mortality drops.

-Second transition: the birth rate begins to decline, but mortality is still down more slowly.

-Modern demographic regime: Mortality rates and very low birth.

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