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Mathematical approximation used to measure the effect of economic growth; this rule tells us the approximate number of years it will take for some measure (real GDP - price level - savings account - etc.) to double given a known annual percentage inc

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1. Mathematical approximation used to measure the effect of economic growth; this rule tells us the approximate number of years it will take for some measure (real GDP - price level - savings account - etc.) to double given a known annual percentage inc





 
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