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Is compounding interest on investments a myth?
Compound growth isn't a myth, it just takes patience to experience.  A 10% annual return will double the investment not in 10 years, but just over 7.  Even though a mortgage claims to use simple interest, if your loan is 5% and there's 14 years to go, $100 extra principal will knock off $200 from the final payment. The same laws of compounding and Rule of 72 are at play.