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2. A commonly used rule-of-thumb in the antitrust practice is the UPP (upward pricing pressure), which we will return to later in the course. For

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2. A commonly used rule-of-thumb in the antitrust practice is the UPP (upward pricing pressure), which we will return to later in the course. For now, it suffices to know that the formula is UPP 12 = 612 (p1 - c1), with 612 the diversion ratio (from prod- uct 2 to product 1 due to a price change of product 1), or expressed in percent- age terms, UPP12 = 61241, where L1 is the Lerner index. The lat- ter statistic, UPPi, can be thought of as a ballpark perunage change in the price of product 2 if two single prod- uct firms producing differentiated prod- ucts 1 and 2 merged, they were en- gaged in Bertrand competition before the merger, and there are no efficien- cies; it does not have to be a merger to monopoly. (a) Explain why a higher value of the Lerner index for product 1 would suggest that the merger result in a higher price of product 2. (b) Explain why a higher diversion ratio 612 would suggest that the merger result in a higher price of product 2. (c) How can it be that when either the Lerner index is zero or the diver- sion ratio is zero then the formula suggests that the merger will not lead to a higher price for product 2

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