Transportation costs are influenced by seven key factors: distance, weight, density, stowability, handling, liability, and market conditions. Carriers consider these factors and allocate costs into variable, fixed, joint, and common categories when determining pricing strategies. Carriers typically employ either a cost-of-service approach to set minimum rates based on expenses or a value-of-service strategy to charge more for critical goods, though often use a combination of these based on trade-offs between costs incurred and value to shippers.