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Compound interest is often called the eighth wonder of the world, and for good reason. It is the process by which interest earned on an investment is reinvested, so that in subsequent periods, interest is earned on the original principal plus the accumulated interest.
Imagine you invest $1,000 at an annual interest rate of 7%. After the first year, you earn $70 in interest, bringing your total to $1,070. In the second year, you earn interest not just on your original $1,000 but on $1,070. This compounding effect accelerates over time, creating exponential growth.
A quick way to estimate how long it takes for your money to double is the Rule of 72. Simply divide 72 by your annual rate of return. At 7%, your money doubles approximately every 10.3 years. At 10%, it doubles every 7.2 years.
The most critical factor in harnessing compound interest is time. An investor who starts at age 25 and invests $200 per month at 8% annual return will have approximately $702,000 by age 65. Someone who starts the same plan at age 35 will only have about $298,000. That ten-year head start nearly triples the final amount.
Compound interest rewards patience and consistency. The earlier you start and the longer you stay invested, the more powerful this force becomes. Even small, regular contributions can grow into substantial wealth over time.
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