Sponsored search advertising has grown rapidly since the last decade and is now a significant revenue source for search engines. To ameliorate revenues, search engines often set fixed or variable reserve price to in influence advertisers’ bidding. This paper studies and compares two pricing...

When a consumer uses a search engine such as Google, her decision to purchase from an advertisement is influenced by other ads displayed on the search page. This externality makes the advertiser's per Ad click profit depend on the set of other ads visible to the consumer. This paper studies the...