THEM: oh this is ugly. i'd like to keep all 3 hats. what's your offer?  YOU: sorry cant give you all three i can give you 2  THEM: 2 hats and a ball?  YOU: no  THEM: 2 hats and 2 books?  YOU: 2 hats 1 book  THEM: eh, i'll concede on this one ; 2 hats, 1 book.  YOU: okay deal.