When looking at an organization's logistics system, which of the following expenses is the single largest variable cost?

Transportation costs are consistently the largest single component of total logistics costs for most organizations. They represent the expense of moving goods from points of origin to points of consumption. As the volume of goods shipped increases, these costs rise, making them the most significant variable expense in the logistics system, often accounting for 60-65% of the total logistics budget. While other costs are substantial, they do not typically exceed transportation expenses.

A. Inventory carrying costs are the second-largest component, typically representing 20-25% of logistics costs, which is significantly less than transportation.
C. Warehouse operations costs include both fixed (e.g., rent) and variable (e.g., labor) components but are generally a smaller portion of the total logistics spend than transportation.
D. Supply management costs are primarily administrative and transactional expenses related to procurement, which are considerably lower than the physical movement costs of transportation.

1. APICS CLTD Learning System, Module 1, Section A, Chapter 1, Topic 1. The text states, "Transportation is the largest single cost in logistics, often accounting for 60 to 65 percent of the total."

2. Bowersox, D. J., Closs, D. J., & Cooper, M. B. (2020). Supply Chain Logistics Management (5th ed.). McGraw-Hill. Chapter 1, "21st-Century Supply Chains," notes that transportation is the largest expenditure in logistics, followed by inventory and administration.