Final answer:
A single-stage cost allocation process is justified when a company produces a few products with similar characteristics in a few departments.
Step-by-step explanation:
A single-stage cost allocation process would be justified when a company produces a few products with similar characteristics in a few departments. This is because the cost allocation process becomes relatively simple and straightforward when there are fewer products and departments to consider. For example, if a company only produces three products in two departments, it is easier to allocate the costs to those specific products and departments rather than dealing with a wide selection of differing products or multiple service departments.