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We’ve been exploring the concept of using open auction to manage advertising on some Stack Exchange sites. Under this model, advertisers (who have been organized into categories based on their products) “bid” for an advertising spot. There is a floor price - a minimum price for the spot, and all bids must exceed that floor price. At this time, only the Mathematics Stack Exchange site (currently in a small-scale test) uses the open auction model.
Advertisers have expressed interest in advertising to sites outside of the technology Stack Exchange sites. These sites have been largely devoid of advertising (although the sites have been eligible for advertising). This initiative aims to help us better understand potential new revenue opportunities and possibly refine our ad strategy in the future while delivering relevant ads to users of this site.