Suppose you propose to sell your neighbor your old car. You tell him that it comes with a new radio that you've just installed, a fresh paint job, and brand-new tires. At this point, for there to be an agreement, he must accept the terms as they are offered to him. Let's assume that he accepted on your terms. On the actual sales day he finds that the radio is not installed as proposed and refuse to accept the inital offer.

Is your neighbor right?