THEM: i'd like the book and the ball for sure. what do you want?  YOU: i'll take the hats, you keep the book and the ball?  THEM: could i also get one hat?  YOU: would lose points with that. i assume ball and book are high value to me, so i went with a compromise.  THEM: i'm also compromising and losing points.  YOU: i'll take three hats and either the book or ball if you'd like a hat, otherwise ; i would need all 4 hats to be fair.  THEM: okay, i'm taking book and ball. you get all hats.  YOU: sounds fair. thank you! i agree.