This specification describes technologies relating to content presentation. In general, one aspect of the subject matter described in this specification can be embodied in methods that include the actions of identifying advertisements that are candidates to be provided within an advertising slot of the content segment, determining, based on respective bids, and the exposure interval, which advertisement will generate greater revenue within the advertising slot, and, providing such an advertisement in the advertising slot. Other embodiments of the various aspects include corresponding systems, apparatus, and computer program products.