Based on the rule of 72, it would require 18 years for an economy to double its real output if the annual growth rate was 4%.

Name: Based on the rule of 72, it would require 18 years for an economy to double its real output if the annual growth rate was 4%.
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The rule of 72 is a simple way to estimate the number of years required to double the value of an investment or economy at a fixed annual rate of interest. By dividing 72 by the annual growth rate (72/4), you get 18 years.

Based on the Rule of 72, It Would Require 18