Joe, who has no skills, no job experience, and no alternative employment runs a shoeshine stand at the airport. Operators of other shoeshine stands earn $10,000 a year. Joe pays rent to the airport of $2,000 a year, and his total revenue from shining shoes is $15,000 a year. Joe spent $1,000 on a chair, polish, and brushes, using his credit card to buy them. The interest on a credit card balance is 20 percent a year. At the end of the year, Joe was offered $500 for his business and all its equipment. Calculate Joe’s opportunity cost of production and his economic profit.