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**:** 2014
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** (.):** reserve price, revenue optimization, competition, competitive pressure, symmetric auctions, position auction

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** (.):** In this paper I analyze the reserve price efficacy of an auction, that is the relative value of the expected revenue increase induced by the optimal reserve price. I define the competitive

pressure in an auction and the notion of one auction dominance over another auction in terms of competition level. After that I prove that the reserve price efficacy decays with respect to the increase of competition level. Finally I provide some examples of auction attributes, which monotonically affect the competition level.

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