Suppose the price of a bottle of water is $4. use the black line (plus symbol) to draw a price line at $4. next use the grey point (star symbol) to indicate how many bottles of water bert will buy at that price. finally, use the green point (triangle symbol) to shade the area that represents bert's consumer surplus from his purchases. in this case, bert receives $ in consumer surplus from his water purchase. if the price falls to $2, bert now buys 3 bottles of water. this his consumer surplus to $ .