Forrester does a wonderful job of explaining the deep simplicity of systems, how this simplicity can produce powerful complexity, and the inherent challenge of leadership.
“every system has in it, two concepts and only two. Now that may strike you as surprising. You may not believe it even after these lectures are over, but when you come to believe it, it is a powerful concept.
As you look at the world around you in all its complexity and realize that everything you’re looking at is one or the other of these two classes (rates and levels). It is a powerful simplifying idea.”