# Why is rule of 70 true? By Nick

### Quick Peek:

The rule of 70 simplifies exponential growth calculations by using the number 70 as a constant. It estimates the time it takes for a value to double at a constant rate of growth and can be used in finance, biology, and population studies. While it has limitations, it is a useful tool for investors, biologists, and population studies researchers. The rule of 70 is a popular formula in finance as it offers a simple way to manage complicated exponential growth.

## The Rule of 70: Simplifying Complicated Exponential Growth

Have you ever wondered how fast your investments will grow over time? Or how long it will take for a population to double in size? The rule of 70 is a simple yet powerful tool that can help you answer these questions and more. In this article, we will explore the reasons why the rule of 70 is popular in finance and how it works.

### What is the Rule of 70?

The rule of 70 is a mathematical formula that estimates the time it takes for a value to double at a constant rate of growth. It works by dividing the number 70 by the rate of return or growth. The result is the approximate number of years it will take for the value to double. For example, if your investment has a rate of return of 7%, it will take approximately 10 years for the value to double (70/7=10).

### Why is the Rule of 70 True?

The rule of 70 is based on the mathematical concept of exponential growth. Exponential growth occurs when a quantity increases at a constant rate over time. This type of growth is common in many fields, including finance, biology, and population studies. The rule of 70 simplifies the calculation of exponential growth by using the number 70 as a constant.

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The reason why the rule of 70 is popular in finance is because it offers a simple way to manage complicated exponential growth. It breaks down growth formulas into a simple equation using the number 70 alongside the rate of return. This makes it easier for investors to estimate the time it will take for their investments to double and to compare different investment opportunities.

### How to Use the Rule of 70

The rule of 70 can be used in many different contexts, including finance, biology, and population studies. Here are some examples of how to use the rule of 70:

– Finance: If you want to estimate how long it will take for your investments to double, simply divide 70 by the rate of return. For example, if your investment has a rate of return of 10%, it will take approximately 7 years for the value to double (70/10=7).
– Biology: If you want to estimate how long it will take for a population to double in size, simply divide 70 by the growth rate. For example, if a population is growing at a rate of 3% per year, it will take approximately 23 years for the population to double (70/3=23.3).
– Population Studies: If you want to estimate the growth rate of a population, simply divide 70 by the doubling time. For example, if a population is expected to double in size in 50 years, the growth rate is approximately 1.4% per year (70/50=1.4).

### Limitations of the Rule of 70

While the rule of 70 is a useful tool for estimating exponential growth, it has some limitations. For example, it assumes that the rate of growth is constant over time, which may not always be the case. It also does not take into account factors such as inflation, taxes, and other expenses that may affect the rate of return.

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In conclusion, the rule of 70 is a simple yet powerful tool that can help you estimate the time it takes for a value to double at a constant rate of growth. It is based on the mathematical concept of exponential growth and offers a simple way to manage complicated growth formulas. While it has some limitations, it is a useful tool for investors, biologists, and population studies researchers.

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