Individual demand and consumer surplus Consider the market for hyperbaric chambers. The market price of each hyperbaric chamber is $165,000, and each consumer demands no more than one hyperbaric chamber. Suppose that Kevin is the only consumer in the hyperbaric chamber market. Their willingness to pay for a hyperbaric chamber is $330,000. Based on Kevin's willingness to pay, the following graph shows his demand curve for hyperbaric chambers. Shade the area representing Kevin's consumer surplus using the green rectangle (triangle symbols)