Final answer:
A volume-based cost system is appropriate for a service company when every customer places a similar demand on the company's resources.
Step-by-step explanation:
A volume-based cost system is appropriate for a service company when every customer places a similar demand on the company's resources. This means that the company's costs are directly related to the number of customers served or the volume of services provided. In this case, the company can allocate its costs based on the volume of services offered, allowing it to analyze and manage its costs more effectively.