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Mirks labs is a British pharmaceutical company that currently enjoys a patent
monopoly in Europe, Canada and the United States, on Zatab (pronounced zay-tab), an allergy medication. The global demand for Zatab is Qd = 15.0-0.2P
Where Qd is annual quantity demanded (in millions of units) of Zatab, and P is the wholesale price of Zatab per unit. A decade ago, Mirk labs incurred $60 million in research and development costs for Zatab. Current production costs for Zatab are constant and equal to $5 per unit.

a. What wholesale price will Murk labs set? How much Zatab will it produce and sell annually? How much annual profit does the firm make on Zatab?
b. The patent on Zatab expires next month expires next month, and dozens of pharmaceutical firms are prepared to enter the market with identical generic versions of Zatab. What price and quantity will result once the patent expires and competition emerges in this market? How much consumer surplus annually will allergy sufferers who take Zatab gain?
c. Calculate the annual deadweight loss to society due to the drug firms market power in Zatab. What exactly does this deadweight loss represent?
d. Given your answer to part c, would it be helpful to society for competition authorities in Europe, Canada, and the United States to limit entry of generic drugs to just five years for new drugs? Why or Why not?

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