THEM: hello there! i'd like the book and the hats, balls can be yours!  YOU: how about i get the book, you get the balls and we split the hats?  THEM: balls are no points to me. i assume hats are low points to you as well and the book is mediocre - - - i'll take 1 book, 1 hat you can have the rest?  YOU: how about i take the book and balls and you get both hats?  THEM: eh, i guess so. deal.