Final answer:
In the insurance industry, a person transacting insurance on behalf of an appointing agent is typically known as a sub-agent or insurance producer, similar to how an actor's agent represents them to a casting director.
Step-by-step explanation:
A person who transacts insurance on behalf of an appointing agent is typically referred to as a sub-agent or insurance producer. This individual is authorized by the appointing agent to act on their behalf in the sale, solicitation or negotiation of insurance policies. The sub-agent will work with clients to assess their insurance needs, present them with options that fit their requirements and help them to understand the various policy features and benefits. In the context provided by Alaine Alldaffer, this scenario seems to refer to a different industry. However, if we translate the concept to insurance, the agent would be like the actor's representative, while the appointing agent would be similar to the casting director. The intermediary agent ensures the proper representation and servicing of the insurance policies to clients on behalf of the insurer or main agent.