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Economics Working Paper Series No. 2014/08
Auckland University of Technology (AUT), Faculty of Business, Economics and Law, Auckland
The diversion ratio is a key ingredient to the calculation of the Upward Pricing Pressure (UPP) test, which is a new shortcut for screening mergers. It measures the degree of substitutability between the merging goods, which affects the potential for price increase post-merger. There is currently little existing research on how the diversion ratio is to be estimated (unlike its cousin, the cross-price elasticity). This paper explores one of the methods to estimate diversion ratios, which is through the estimation of a demand system. Specifically, this paper shows that the estimated value of the diversion ratio is, in fact, little affected by one of the most contentious decisions in merger analysis: the definition of the market boundary.
Upward pricing pressure
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Working Paper

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