No matter where you are in your life, whatever set of people you're with, it all still breaks down like high school does. You have your social cliques, you have the people you get along with, the people you don't and the people you're ambivalent about. All of the dynamics are still here.
I learned from Mr. Wrigley, early in my career, that loyalty wins and it creates friendships. I saw it work for him in his business.