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The causes of the Economic Boom of the 1920s were the Republican government's policies of Isolationism and Protectionism, the Mellon Plan, the Assembly line and the mass production of consumer goods such as the Ford Model T Automobile and luxury labor saving devices and access to easy credit on installment plans.
Demography is important in planning for the future as it allows experts and policy makers to study the changes in population and respond appropriately through policies that reflect these changes. For instance, they can be able to plan appropriately on how to handle the aging in terms of pensions and welfare