It´s a summer holiday weekend and a bloke walks into a butcher shop which has a sign in the window saying, “Ground Sirloin: 49¢ per pound.” The man says, “I´m having a cookout this weekend. I´d like 5 pounds of your ground sirloin, please.” The butcher shakes his head and says, “Sorry. I´m all out.” The man, disappointed, goes down the street to another butcher shop and asks, “How much is your ground sirloin?” The proprietor replies, “It´s $5.49 per pound.” “Five forty nine!?!” exclaimed the customer. “Just up the street there’s a butcher that sells it for 49¢!” The butcher smiles calmly at the gentleman and asks, “Does he have any?” “No. He´s out of it right now.” “Well,” says the butcher. “When I don´t have any, I sell it for 39¢ per pound!”