THEM: i want the basketball and 1 of the hats.  YOU: i would like the basketball and both books  THEM: i can give you both books, but i am pretty stuck on the basketball.  YOU: hm, what if you gave me both books and both hats and you got the basketball?  THEM: i can give both books, but i want 1 hat.  YOU: no, then i will need the basketball and you can have the books and the hats  THEM: the i resend my offer and i want both hats and the basketball.  YOU: no, that deal doesnt work for me at all  THEM: i am pretty much not moving off the ball and a hat. i believe the trade off is more than fair.  YOU: then we dont have a deal  THEM: i guess we don't.