What you need to know

The doubling time is shorter the higher interest rate!

This explains one of reasons why the FED is manipulating interest rates down to keep the debt load (the interest payments on Government, Corporate Debt) sustainable for a bit longer. –which is giving those in the know, like you and I, time to prepare accordingly.

Continued growth no matter the rate of growth will compound and eventually double. Doubling leads to exponential growth.