primary functions of inventory

  Identify four primary functions of inventory, and give a practical example to illustrate each function in an action related to an aviation or aerospace operation. Define three account categories of inventory carrying costs and provide a concrete example or illustration of each such cost applied in the aviation or aerospace fields. Compare and contrast the effects of three main transportation cost factors on how those factors influence the choice of air transport versus the use of truck or rail transport. Include at least one authoritative reference source with your report.