What is cost-of-service pricing? What is the relationship between value-of-service pricing and cost-of-service pricing? What is a released value rate and how does its use affect a shipper's transportation costs? What are the major forces that affect carrier pricing strategies? How might pricing strategies differ among carriers in competitive markets, oligopolistic markets, and monopolistic markets? Why were tariffs created? Are they still useful in today's transportation environment? please I need a lot of explanation