In his "American Buffalo," Mamet renders the world of business, where selfishness and opportunism hold control over different matters and exclude friendship, as one of the noble sentiments, from their calculations. For instance, Fletch, a card player, makes a deal with Ruthie, another card player and a friend of his, to buy some of her pig iron. However, he steals her pig iron, and, consequently, they became separated. Don comments on that situation, showing the nature of business and friendship to Bob, saying: "... that"s what business is ?óÔé¼?ªthere"s business, and there"s friendship ..." Don explains, the non-existence of friendship,...
for the feelings of each other. Even when Teach insults Don about his relation with Bob and, then, apologizes to him and to Bob, he does it so as not to let their problems have any bad impact on their work.

Therefore, the contemporary world of business in America has no place for friendship or any other noble sentiments. It is introduced by Mamet as a jungle which has no place for laws, ethics, and friendship; Teach says: The Whole Entire World. There Is No Law. There Is No Right And Wrong. There Is No Friendship. Every Fucking Thing.