THEM: i get the ball and 1 book. you the rest  YOU: can't do that. i need the ball, and two hats. you can have both books.  THEM: no deal then  YOU: i will take the ball and one hat then. you can have both books and a hat. even then i'd be taking a bit of a loss.  THEM: the hat has a 0 vale for me and the book is only 1 point  YOU: then we can't agree. i need the ball and at least one hat.  THEM: sign no deal agreed then  YOU: no deal.  THEM: what is the ball worth to you?  YOU: 6  THEM: the ball is only 1 point  YOU: ok, so then i need the ball and one hat. you can have the books and one hat.