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First, an apology for using the term "frenemy." I hate this word but find it useful for this post. What is compound interest? From our friends at Wikipedia: Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest. How does it work? With stunning efficiency. For instance, if you have an interest-bearing savings account, compound interest is your friend, as your banking institution will pay interest (albeit a minisule amount these days) on the principal dollar amount. Over a long period of time, compound interest is earned on both the principal and accumulated interest, eg $100 principal + 5% interest = $105.00. Left untouched, your next round of 5% interest will be paid on the $105.00 balance, resulting in a sum total of $110.25. This is a simple (and unrealistic, in terms of interest paid) example of money making money. If, however, you have debt on an interest-bearing loan, compound interes...