THEM: i'll give you 1 hat and 1 book  YOU: i will take the ball and the books. you can keep the hats  THEM: nope that does not have value to me.... i'll give you 2 hats and 1 book  YOU: i will take the ball and the hats you keep the books  THEM: cannot give up the ball....  YOU: if you get the ball i need everything else  THEM: nope, i'll give you 2 hats and 2 books, final offer  YOU: deal.