18. A computer-implemented method for evaluating the supply of electronic content on an electronic network, the method comprising: receiving search results history for a plurality of queries by users for at least one keyword; determining, based on the search results history, an abandonment rate for the plurality of queries for the at least one keyword, wherein determining the abandonment rate includes calculating a number of times the users abandoned queries by not clicking on any result in the search results history for the plurality of queries for the at least one keyword; determining a search results variability of the search results history for the plurality of queries for at the least one keyword, wherein determining the search results variability includes calculating a number of unique results contained in the search results history for the plurality of queries for the at least one keyword; determining, with at least one processor, a supply value indicative of a supply of electronic content on the electronic network relating to the at least one keyword, based on at least one of the determined search results variability or the determined abandonment rate; and making available, over the electronic network, an additionally supply of electronic content relating to the at least one keyword based on the determined supply value.
18. A computer-implemented method for evaluating the supply of electronic content on an electronic network, the method comprising: receiving search results history for a plurality of queries by users for at least one keyword; determining, based on the search results history, an abandonment rate for the plurality of queries for the at least one keyword, wherein determining the abandonment rate includes calculating a number of times the users abandoned queries by not clicking on any result in the search results history for the plurality of queries for the at least one keyword; determining a search results variability of the search results history for the plurality of queries for at the least one keyword, wherein determining the search results variability includes calculating a number of unique results contained in the search results history for the plurality of queries for the at least one keyword; determining, with at least one processor, a supply value indicative of a supply of electronic content on the electronic network relating to the at least one keyword, based on at least one of the determined search results variability or the determined abandonment rate; and making available, over the electronic network, an additionally supply of electronic content relating to the at least one keyword based on the determined supply value. 22. The method of claim 18 , wherein the at least one keyword includes a group of related keywords.