4 . Total economic surplus The following diagram shows supply and demand in the market for laptops. Use the black point (plus symbol) to indicate the equilibrium price and quantity of laptops. Then use the green point (triangle symbol) to fill the area representing consumer surplus, and use the purple point (diamond symbol) to fill the area representing producer surplus. Demand 300 270 Equilibrium 240 A 210 180 Consumer Surplus 150 PRICE (Dollars per laptop) 120 Producer Surplus 90 30 Supply 30 60 90 120 150 180 210 240 270 300 QUANTITY (Millions of laptops) Total surplus in this market is $ million