According to the CTSC Exam Content Manual1, functional products are products that have stable and predictable demand, low product variety, long life cycles, and low profit margins. They would be best suited for an efficient supply chain, which focuses on minimizing costs, maximizing asset utilization, and optimizing processes. An efficient supply chain would have high capacity utilization, low inventory levels, long production runs, and standardized products and services.

1: https://www.ascm.org/ctsc-ecm/