Calvin’s Barber Shops, Inc. has a monopoly on barbershop services provided on the south side of Chicago because of restrictive licensing requirements, and not because of superior operating efficiency. As a monopoly, Calvin’s provides all industry output. For simplicity, assume that Calvin’s operates a chain of barbershops and that each shop has an average cost-minimizing activity level of 750 haircuts per week, with Marginal Cost = Average Total Cost = $20 per haircut.