THEM: i get book and hats you get balls  YOU: i need book  THEM: you get book i get rest  YOU: i need book with one hat  THEM: no deal. let's negotiate please  YOU: book with hat, you get hat and two bballs  THEM: i get book and 1 hat or no deal.  YOU: i need book or no deal  THEM: no deal then.  YOU: agreed.