Two fundamental shapes: logarithmic and exponential.

Logarithmic: starts off quickly, but then hits a ceiling it never surpasses even with infinite effort.

Exponential: starts off slowly (compared to logarithmic), but then self-accelerates to infinity.

Logarithmic systems are closed systems.

Exponential systems are open-ended systems.

When you focus on quick returns, you will pick the logarithmic.

When you focus on a longer time horizon, you'll pick the exponential.