In Level 2 you saw a balancing loop that fights back. This is the opposite. A reinforcing loop takes whatever is happening and pushes it further. More water in the tank means more inflow. More followers means more visibility means more followers. More debt means more interest means more debt.
Move the growth rate slider. Watch the curve. It starts slow, then goes vertical. That is exponential growth. It feels like nothing is happening, then everything happens at once.
There is no built-in brake here. It runs until it breaks. That is the lesson. Reinforcing loops need something external to stop them.
Jargon you just learned
- Reinforcing Loop
- A feedback loop where the output amplifies the input. More leads to more.
- Positive Feedback
- Not "good" feedback. Feedback that pushes in the same direction, amplifying change.
- Exponential Growth
- Growth that accelerates because each increase fuels the next increase.
- Compounding
- Small repeated gains that build on themselves. 1% daily is 37x in a year.
- Runaway
- When a reinforcing loop has no balancing force and grows until something breaks.
What to notice
At 1% growth, the curve looks almost flat. At 10%, it explodes. But both are exponential. The shape is the same. The only difference is how long before you notice. This is why people underestimate compounding. By the time the curve goes vertical, you are already out of time to react.