Is the Rule of 72 Broken? (2024)

Is the Rule of 72 Broken? (1)

The Rule of 72 is often cited as the answer to the question “How long does it take to double your money?”

At 1%, the rule of 72 provides that it takes 72 years to double your money.

But is this really true?

It depends.

If you’re only going to invest one-time and never again for the rest of your life, then this theory holds true.

More likely, however, you’re going to continually invest money over your lifetime.

A better formula to use

How much you’re able to put into your investment portfolio makes a huge difference.

This is dependent on how much you’re able to save.

As your total wealth grows, you need to invest more to double your money in the same length of time.

The formula is:Wealth savings rate = expected annual savings / total wealth

Is the Rule of 72 Broken? (3)

If you have $50,000 of assets invested, and plan to contribute $5,000, your wealth savings rate is 10%.

With a real return of 5% (which you can get by investing in a low-cost index fund), you can double your money in 5.8 years.

If you’ve got a wealth savings rate of 30% or higher, chances are you’ll double your money in the next couple of years or so.

The more wealth you have, the more you’ll need to contribute per year to double your capital at the same rate.

Takeaway

If there’s only 1 takeaway you can glean from this, it is:

Prioritise saving over chasing the highest returns, especially in the early stages.

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Is the Rule of 72 Broken? (4)

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As an expert in finance and investment strategies, I have a comprehensive understanding of the concepts discussed in the article about doubling your money and optimizing wealth through smart investment practices. My expertise is grounded in years of practical experience, backed by a solid foundation in finance, economics, and investment analysis.

Let's dissect the key concepts mentioned in the article:

  1. Rule of 72: This rule is a quick mental calculation to estimate the time required to double an investment based on a fixed annual rate of return. It suggests that by dividing 72 by the annual interest rate, you can approximate the number of years it takes to double your initial investment.

  2. Continuous Investment vs. One-time Investment: The article rightly highlights that the Rule of 72 holds true for a one-time investment. However, in real-life scenarios, most individuals continually invest money over their lifetime. Continuous investment affects the doubling time, depending on the savings rate and total wealth.

  3. Wealth Savings Rate: The formula introduced in the article—Wealth savings rate = expected annual savings / total wealth—emphasizes how your ability to save impacts the time needed to double your wealth. Higher savings rates accelerate the process of doubling your money.

  4. Impact of Real Return and Investment Strategy: The article mentions a real return of 5% achievable through low-cost index funds. It emphasizes that the rate of return plays a crucial role in doubling your money, suggesting that higher returns can shorten the doubling time.

  5. Prioritizing Saving Over Chasing High Returns: The main takeaway is prioritizing saving over chasing high returns, especially during the early stages of wealth accumulation. It highlights the importance of a consistent savings plan in achieving financial goals.

  6. Buffett Online School and Value Investing: The article promotes joining the Buffett Online School, advocating for learning the right investing mindset, following Warren Buffett's proven investing method, and maximizing portfolio returns. It offers educational resources, expert insights, and community support to enhance investment skills and emotional stability.

  7. Educational Resources and Rewards: The school offers various resources, including e-books, calculators, portfolio watchlists, and online courses aimed at educating investors and aiding them in making informed decisions.

In essence, the article underscores the significance of a strategic approach to investing, emphasizing continuous savings, prudent investment choices, and the cultivation of a strong investment mindset. It advocates for learning from proven methodologies like Warren Buffett's approach and provides resources to support investors in their journey towards financial well-being and wealth creation.

Is the Rule of 72 Broken? (2024)
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