THEM: i'd like the book and two balls.  YOU: i need the book, you can have rest  THEM: i also have to have that book. i meant to say that i want book and the hats. i'd be willing to let you have a hat. that is what i nice guy i am.  YOU: hats are useless to me  THEM: we've got no deal if i don't get the book. sorry no room on that.  YOU: ok, i guess no deal.