THEM: i would like both books and a hat  YOU: i can not make that deal. i need the books as well. can we split the difference? you can have one book and the hat and i can have the book, the hat and the ball?  THEM: i just want the books  YOU: i need the books as well. i can not make a deal without a least one  THEM: ok, one hat one book  YOU: i need the ball as well  THEM: yea you get one ball, book, hat  YOU: okay deal.