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Fertility DeclineInfant MortalityConsumer Credit PolicyPopulation GrowthMedicalization of SocietySocial Security CoverageEconomically Active PopulationAgricultural EmploymentModernization TheoryUrban EmploymentDemographic TransitionStable PopulationReproductive BehaviorFundamental ElementsMathematical FunctionConsumer SocietyMixed BloodUnintended ConsequencesHealth Care PolicyAgricultural Production