The market for electricity is a naturally monopolistic market. The graph below depicts the monthly demand and marginal revenue curves for this market and the marginal cost and average total cost curves of the monopolist supplier. The quantity of electricity is measured in kilowatt-hours (KWh) per month, and the price is measured as the price per kilowatt-hour of electricity. Price $0.70 $0.60 $0.50 $0.40 $0.30 ATC - $0.20 MC $0.10 .MR Demand 40 80 120 160 200 220 240 Quantity (millions of KWh)