A firm that produces a can opener of the unique, patent design has no real competition in it's particular market niche and, therefore, is a price maker. The graph shows the firms demand (D), marginal cost (MC), and marginal revenue (MR) curves. The price of $30 based on the MR=MC rule for profit maximization. The rectangular region shown represents the net revenue from sales of the can opener (total revenue minus total variable costs associated with sales of the product). Use the area tool to outline the region representing what the net revenue would be if the firm could practice perfect price discrimination.