A cost maintenance scheme useful with an advertising system which orders ads in a manner that maximizes both their relevance and their economic value, and which provides a fair bidding process in which a winning bidder is assured of not having paid too much. Ordering may be done based on accepted maximum...http://www.google.de/patents/US7844493?utm_source=gb-gplus-sharePatent US7844493 - Automated price maintenance for use with a system in which advertisements are rendered with relative preference based on performance information and price information
