Recently, Pfizer and Allergan-the makers of Viagra and Botox, respectively-initiated a $160 billion merger. Pharmaceutical companies tend to spend a greater percentage of sales on R&D activities than other industries. The government encourages these R&D activities by granting companies patents for drugs approved by the Food and Drug Administration. For instance, Allergan spent large sums of money developing its popular wrinkle-removing neurotoxin, Botox, which is currently protected under a patent. Botox sells for about $15 per vial. Calculate the Lerner index if the marginal cost of producing Botox is $1.50 per vial. Does the Lerner index make sense in this situation? Explain.