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Mostly summarized from Gregory Mankiw’s Principles of Economics, 5th Ed. PART 9 The Real Economy in the Long Run Chapter 27 of 36 Basic Tools of Finance Section 5 of 16 … Compounding and the Rule of 70 Country A has an average growth rate of 1% per year, and Country B has an average growth rate of 3%. This two percent difference might seem insignificant. Small yearly percent growth rates become large after compounded over many years. Suppose Jerry and Elaine take their first jobs at the age of 22 and both earn $30,000 a year. Jerry lives in an economy where GDP and incomes grow at 1% per year. Elaine lives in one where GDP and incomes grow at 3% per year. Forty years later both are 62 years old. Jerry earns $45,000 yearly. Elaine earns $98,000 yearly. The difference of 2 percentage points in the growth rate has made Elaine's salary more than twice Jerry's. … “The rule of 70,” helps to understand growth rates and the effects of compounding. According to the rule of 70 · if som...