• 1. Introduction
  • 2. Web Information Retrieval
  • 2.1. Overview of IR-Models
  • 2.2. Web Searching
  • 3. Search Engines
  • 3.1. Challenges
  • 3.2. Search Engine Architecture
  • 3.3. Ranking Techniques
  • 3.4. Trends
  • 3.5. Revenue Sources
  • 4. The Information Market
  • 4.1. The Information Economy
  • 4.2. Transaction Costs
  • 4.3. Economics of Attention
  • 4.4. Mass Media
  • 4.5. Diversity of Opinions
  • 5. Search Engines from an Agency Theory Perspective
  • 5.1. The Basic Concept of Agenca Theory
  • 5.2. The Optimal Delegation of Power
  • 5.3. Power Roles
  • 5.4. Design Patterns
  • 5.5. Design Strategies
  • 5.6. Choice Strategy
  • 6. Conclusions