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A second way is the rule of 77. That holds that if you divide the interest rate into 77, that gives you the number of years it takes for your investment to double. Hence, at 10% average return, your money doubles every 10 years.

I thought it was the rule of 72. Probably doesn't matter much, one of those rought estimate things. However, at 10% average return, your money would double every 7.2 (or 7.7 years).

Another way to look at inflation. At 3% inflation, the buying power of money would be 1/2 every 24 years. So your $1 million now would buy less than $500,000 in 30 years in today's dollars.


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