Joe, who has no skills, no job experience, and no alternative job, runs a shoeshine stand. Other shoeshine operators earn $10,000 a year. Joe pays rent of $2,000 a year, and his total revenue is $15,000 a year. Joe spent $1,000 on equipment and he used his credit card to buy it. 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 economic profit.