When something grows by a fixed percentage each period, it explodes: A = P(1 + r)t. Model populations, revenue, bacteria, social growth — and get the doubling time.
| Period | Value | Growth |
|---|
The classic compounding model.
ln 2 / ln(1+r) exactly.
Negative rates show halving time.
Growth path, period by period.
Exponents run the world.