5. Price-discriminating monopolist Maria owns a plot of land in the desert that isn't worth much. One day, a giant meteorite falls on her property, making a large crater. The event attracts scientists and tourists, and Maria decides to sell nontransferable admission tickets to the meteor crater to both types of visitors: scientists (Market A) and tourists (Market B). The following graphs show daily demand (D) curves and marginal revenue (MR) curves for the two markets. Maria's marginal cost of providing admission tickets is zero