Question 4 Explanation Confusion

The rules state that K must be before I and L, yet in the 4th explanation, the game is set up with K - I - L formation. I'm confused as to why L can't go anywhere else in the game except for after the K - I sequence; how do we know that L is always going to make more money than N? I understand that L has to be after K but there aren't any other rules that specify or imply that L's position has to always be before N's. Thank you!