A Penny Doubled or $1,000,000 — Modern Dollar (2024)

This is the power of compound interest. While it’s up for debate, some say Einstein called compound interest the 8th Wonder of the World.

Most of us instinctively understand that we should be saving. Your parents, the internet and all the Fidelity commercials on TV tell you to save. It can feel like a futile exercise, though. Squirreling away a small monthly sum seems as if it will never amount to anything. Compound interest, the holy grail of saving, can be as exciting as watching paint dry when you’re in the first decade of building wealth. Saving is boring.

The Rule of 72

I want to give you another powerful tool for understanding compound interest. We know that you can’t double your money everyday, but there is a rule in finance that can tell you how long it will actually take to double your money. It’s called the rule of 72.

The Rule of 72 can make saving a little more exciting. It’s pretty simple. Divide 72 by your annual rate of return on an investment and you have the amount of time it will take for that investment to double.

72 / Annual Return = Years to Double Initial Investment

For example, if you invested $10,000 today and earned 10% annually on that investment, it would be worth $20,000 in 7.2 years. That’s pretty cool. The exciting part, however, happens when you give an investment time to double 3 and 4 times. In under 22 years, that $10,000 turns into $80,000. This is how wealth is built over your life.

It Doesn't Get Exciting for Awhile

The bad part about letting your money compound is that it doesn’t get exciting for a while. In the penny example, by the third Saturday, you still only have $10,485.76. At that point, you might be kicking yourself for not taking that million upfront. But over that last 10 days, your money goes up more than 1000x. Patience pays.

As a financial expert with a deep understanding of investment principles, let me first emphasize the significance of compound interest. This financial concept, often referred to as the "8th Wonder of the World" (attributed to Einstein, though this is debatable), holds the key to building substantial wealth over time.

Now, let's break down the key concepts mentioned in the article:

  1. Compound Interest:

    • Compound interest is a powerful force that allows your money to grow not just on the initial principal but also on the accumulated interest over time. This compounding effect accelerates wealth accumulation.
  2. Savings and the Perception of Boredom:

    • The article touches upon the common perception that saving money can be dull or seemingly ineffective, especially when stashing away small amounts regularly. This sentiment is often challenged by the potential of compound interest.
  3. The Rule of 72:

    • The Rule of 72 is a valuable tool mentioned in the article. It provides a quick and simple way to estimate how long it takes for an investment to double based on a fixed annual rate of return. The formula is: Years to Double = 72 / Annual Rate of Return. The article uses an example of a $10,000 investment with a 10% annual return doubling in approximately 7.2 years.
  4. Long-Term Wealth Building:

    • The article emphasizes the power of patience in wealth-building. It suggests that the real excitement of compound interest unfolds when you allow your investments to double multiple times over an extended period. This long-term approach is illustrated with an example where a $10,000 investment turns into $80,000 in under 22 years with the compounding effect.
  5. Patience and Delayed Gratification:

    • The article acknowledges that the excitement of compound interest takes time to materialize. Using the example of a penny doubling each day, it illustrates that the growth may not seem significant initially, but over time, the returns become substantial. This underscores the importance of patience and delayed gratification in investment strategies.

In summary, the article underscores the transformative potential of compound interest and introduces the Rule of 72 as a practical tool to understand the time it takes for investments to double. It encourages readers to embrace a patient, long-term perspective for effective wealth building.

A Penny Doubled or $1,000,000 — Modern Dollar (2024)
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