Which of the following modes of transportation is characterized as having the highest fixed cost and lowest variable cost?

Pipeline transportation has the highest fixed costs and lowest variable costs among all modes. The fixed costs are extremely high due to the significant capital investment required for construction, rights-of-way acquisition, and pumping stations. However, once operational, the variable costs to transport an additional unit of product (typically liquids or gases) are very low, primarily consisting of the energy required for pumping and minimal labor. This cost structure makes pipelines highly efficient for moving large, continuous volumes of specific commodities.

A. Air transportation has low fixed costs (shared airports, no owned routes) but the highest variable costs (fuel, crew, maintenance per flight).
B. Water transportation has high fixed costs (vessels, port infrastructure) and relatively low variable costs, but not as extreme as pipelines.
C. Rail transportation has very high fixed costs (track, locomotives, yards) and low variable costs, but pipelines represent a more extreme case of this trade-off.

1. APICS CLTD Learning System, Module 3, Section A, Topic 1: Transportation Fundamentals. The module details the cost structures of different transportation modes, highlighting that pipeline has the highest fixed cost and lowest variable cost.

2. Coyle, J. J., Langley, C. J., Novack, R. A., & Gibson, B. (2017). Supply Chain Management: A Logistics Perspective (10th ed.). Cengage Learning. Chapter 10, "Transportation Management," compares the cost and service characteristics of the five primary modes, consistently ranking pipeline as having the highest fixed and lowest variable costs.