Final answer:
The subject of this question is Business and the type of fee Dominic is paying is a listing fee.
Step-by-step explanation:
Dominic pays a small fee to the auction site. The type of fee Dominic is paying is called a listing fee. A listing fee is a fee charged to a user to list an item or service for sale on an auction site.
Unlike a subscription fee, which would be a recurring fee for accessing certain features or benefits of the auction site, or a transaction fee, which would be charged when Dominic sells an item on the auction site, a listing fee is specifically for the act of listing an item or service for sale on the site.