Abstract: A method and system that allows advertisers to bid for favorable placement of their ads relative to other advertisers, over a given time period and at a fixed cost. The provider of said system solicits ads from advertisers via an electronic interface. The advertisers provide ad copy, indicate how much they are willing to spend (ad price) for a given time period and then submit this information to the provider's servers. The ads appear, sorted by ad price, when potential customers submit search engine queries against a database of information which includes, but is not necessarily limited to, the ad copy submitted by the advertisers. Unlike pay-per-click or other pay-per-[action] systems, this invention is immune to click fraud and other types of end user fraud including automated fraud.