Abstract: In one embodiment, the invention provides a method, comprising allowing primary bidders to each place a primary bid for displaying an associated advertisement within a results page of a search based on a search string; and allowing a secondary bidder to selectively place a secondary bid to augment the primary bid of a primary bidder by a monetary amount.

Abstract: The invention provides a method. The method comprises receiving a user-input search string from a node; determining an attribute of the user; determining if there is an advertisement associated with the search string and attribute combination; performing a search based on the search string using a search engine; and causing the advertisement to be displayed together with a result of the search on a display associated with the node.