THEM: i want 1 book and 1 ball, you take 2 hat, deal  YOU: i want 3 balls and i will give you 1 book and 1 hat  THEM: i don't have 3 ball holds 2 ball  YOU: the i will take 2 balls and 1 hat and give you 1 book and 1 hat.. deal?  THEM: deal.