THEM: i'd like the book and balls.  YOU: not possible. i need the book and 2 hats  THEM: you can have the hats, if i can have the book and balls.  YOU: not a good deal for me. i have to have the book and one other item  THEM: i can't do the book. sorry. how about i take the book and you take everything else?  YOU: i can't do that, i need the book or no deal  THEM: can't do the book. that's the only thing i have of value.  YOU: me too, no deal then  THEM: sorry.  YOU: no problem.