Final answer:
The agents typically include Auction houses, Realtors, and Travel facilitators, as they act on behalf of others to facilitate transactions and services. Airlines can also be agents in certain contexts. Automobile manufacturers, however, do not act as agents as they produce and sell their goods directly.
Step-by-step explanation:
Typically, the agents in a transaction are those who act on behalf of another party to facilitate a service or a deal. Auction houses and Realtors commonly serve as agents in their respective domains, facilitating transactions of goods and real estates between sellers and buyers.
Travel facilitators operate as agents in the tourism industry, planning and arranging travel details for clients. Airlines can also sometimes act as agents, especially when they sell tickets on behalf of other airlines as part of code-sharing agreements or travel packages.
However, Automobile manufacturers are not typically considered agents because they produce goods and sell them directly to the consumers or through their own distribution channels (dealerships), rather than acting on behalf of another entity.