We study the bidding strategies of vertically differentiated firms that bid for sponsored search advertisement positions for a keyword at a search engine. We explicitly model how consumers navigate and click on sponsored links based on their knowledge and beliefs about firm qualities. Our model...

We systematically overview the literature in key word search and propose several promising research directions. The paper is organized by each agent in the search process: searchers, advertisers and the search engine, and reviews the key research issues for each. For each group, we outline the...

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...