They say that power is seductive and that giving it up can be incredibly hard to do. But that is what David Erdal did when he turned his family run business into an employee owned company. He says the consequences for him were embarrassing, emotional, hugely psychologically complex but overall satisfying. He went from being the boss to being just the same as everyone else in the company. In this episode of Brainwaves, Pennie Latin looks at the role of rank and hierarchy in our society. She asks how much does it actually matter to us and what can we learn about ourselves by looking at rank and hierarchy in some of our nearest evolutionary neighbours, chimpanzees.