THEM: i would like both books. you can have the hat and two balls.  YOU: i would like the books as well  THEM: there's no way that i can give up either book. i would need both.  YOU: hmm  THEM: i'm sorry to be a pain, but the hat and balls will get me nowhere. i would absolutely need both books.  YOU: ok, both books to you and i take the rest  THEM: ok, thanks. it's a deal! i get both books, you get the balls and the hat.