19. The method of claim 18 , further including: determining an advertising value associated with the at least one keyword; adjusting the supply value based the determined advertising value; and making available the additional supply of electronic content relating to the at least one keyword based on the adjusted supply value.
19. The method of claim 18 , further including: determining an advertising value associated with the at least one keyword; adjusting the supply value based the determined advertising value; and making available the additional supply of electronic content relating to the at least one keyword based on the adjusted supply value. 20. The method of claim 19 , further including: determining, based on the search results history, a time period associated with the queries for the at least one keyword; adjusting the supply value based the time period; and making available the additional supply of electronic content relating to the at least one keyword based on the adjusted supply value.