What is the theme in The Rag and Bone Shop by Robert Cormier?

One of the primary themes in the novel is greed. Greed represents itself in a couple of different ways throughout the novel. First, greed shows in the bullying that Bobo Kelton does to his classmates. Bobo's greed is his need to show that he is superior and stronger than his fellow classmates, including the girl he gropes in the hall and Jason Dorrant, who Bobo attacks in the school cafeteria.