THEM: i would like the hat and the book.  YOU: i need hat  THEM: i need the hat as well, what can you offer instead?  YOU: hat worth too much. are we at no deal?  THEM: i think so.  YOU: ok, we talk until button  THEM: how about if i take the hat and you take the rest?  YOU: hmmmmm. no, hat is needed, has my name on it  THEM: okay i guess we can't make a deal then.  YOU: no.