Bob is a biology teacher whose hobby is refinishing antique furniture. Bob shops yard sales and estate auctions looking for nice antiques to refinish. The problem is that Bob can never pass up a bargain and purchases items at garage sales that he later realizes he doesn't have room for or doesn't want. Sometimes among these purchases are pieces of furniture that do not need refinishing. Thus, Bob has a problem accumulating too many things and has a garage full of items he plans to refinish and other bargains he could not pass up. To solve this problem, Bob has a yard sale at his home two or three times a year. He is careful never to have four sales in one year because his city requires a business license for four or more sales in one year. At one of his yard sales, he has a nice antique dining room table and chairs for sale for $600. Mike, a garage sale shopper, sees the table and is very interested in it. Mike says, "I'll give you full asking price, but I can't know for sure until my wife sees it and likes it also. Can you hold it until 3 p.m? I know my wife and I can be back by then." Bob gives Mike a small piece of paper on which he has written, "I will give Mike Smith until 3 p.m. to decide whether to purchase the dining room table and chairs for $600." When Mike returns at 2 p.m. with his wife, he sees the table and chairs in the back of a truck as the truck pulls away. Mike wants to know whether he has a case against Bob. Discuss.