Because we bump into reinforcing loops so often, it is…
““Because we bump into reinforcing loops so often, it is handy to know this shortcut: The time it takes for an exponentially growing stock to double in size, the “doubling time,” equals approximately 70 divided by the growth rate (expressed as a percentage). Example: If you put $100 in the bank at 7% interest per year, you will double your money in 10 years (70 ÷ 7 = 10). If you get only 5% interest, your money will take 14 years to double.””
About This Quote
This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.
She explains the “doubling time” rule: time to double ≈70 divided by growth rate percentage.
In simple terms: Doubling time ≈70 ÷ growth rate%.
Key Takeaway
Use the rule to forecast growth.
Themes
systems
growth
exponential
Mood
educational
analytical
Type
technical
practical
When to use this quote
- investment planning
- resource management
- public policy
Key Concepts
economics
finance
population dynamics
Questions to Reflect On
- How does this rule apply to your field?
- What limits exponential growth?
A Different Perspective
Rule is an approximation, not exact.