I was surprised to see no mention of Little's law[1]. It's a simple and powerful little theorem with practical implications. [1] https://en.wikipedia.org/wiki/

I was surprised to see no mention of Little's law[1]. It's a simple and powerful little theorem with practical implications. [1] https://en.wikipedia.org/wiki/Little%27s_law https://en.wikipedia.org/wiki/Little%27s_law