16. The method of claim 14 , wherein a level of an advertisement within the hierarchal set of search results pages comprises a rank, and wherein multiple values of d* are calculated for each search results page of the set of hierarchal search results pages.
16. The method of claim 14 , wherein a level of an advertisement within the hierarchal set of search results pages comprises a rank, and wherein multiple values of d* are calculated for each search results page of the set of hierarchal search results pages. 18. The method of claim 16 , the method further comprising: computing class cardinality of the plurality of advertisers based on price bid elasticity of each advertiser for the keyword; and if a value for d* reaches a rank-depth corresponding to a class K of advertiser, decrementing d* corresponding to the rank-depth by 1 until the advertiser class of the rank-depth corresponds to a class K−1; wherein the advertiser classes comprise at least, in descending order, market maker, market neutral, and market follower.