This question deserves serious thought, as there are pros and cons to the various cost models. Making the right choice requires a full understanding of the implications of each model, as well as a firm understanding of your goals and capabilities. There are three major types of cost models for metasearch campaigns: 1. CPC – cost-per-click 2. CPA – cost-per action, where publishers charge a flat fee or % of booking value 3. Hybrid – which is a combination of the two Get the full story at Koddi