In a system for control sales of vehicles, which is the appropriate word. Dealer or concessionaire? In order to refer to a place where they do sell vehicles.
What are the differences?
Concessionaire is so uncommon I don't think I've ever heard anyone use the word. Also, it usually refers to someone who operates a specific business (a concession) on someone else's property. Don't use it. The idiomatic term in US English for someone who sells cars is a car dealer.
Dealer is the word you are looking for. Concessionaire has a very specific meaning that would only apply in very specific circumstances. The definition "the holder of a concession or grant, especially for the use of land or commercial premises" is accurate but needs examples. The US government "owns" Yellowstone Nation Park and operates the Park generally. Park Service personnel staff the Entrance gates, Visitor Centers, campgrounds, and police the roads and back country. But the Park Service grants concessions to other companies that operate the Hotels, Gas Stations, and Stores. The company that operates the Park's Hotels is the concessionaire for the Hotels concession. The company that operates the Park's Gas Stations is the concessionaire for the Gas Station concession. Likewise for the Park's stores. Similarly, the owner / operator of large sports and concert venues usually offers a concession of the "snack food" business inside the venue. The operator of the snacks concession is the snacks concessionaire at that venue.
So, the only way a car dealer would also be a concessionaire would be in a specific situation where, for example, the owner of Yankee Stadium in New York granted a concession to operate a car dealership inside the stadium (on Stadium grounds). The owner/operator of the concession might be a Lexus dealer during one concession contract and a BMW dealer during another contract. Both contract holders (Both car dealers) would be considered Yankee Stadium's automobile concessionaire during the terms their contracts were in force.
definitions from Google dictionary
concessionaire
noun the holder of a concession or grant, especially for the use of land or commercial premises.
This definition is correct but doesn't help in this context.
I know now the part below is wrong! I am keeping it here because I think it's important to 'fess up to errors.
If you are holding something in concession (I think this is what you are asking), then the concessionaire gets a percentage of the sale of the product or item that the seller earns. I sell used clothing (I am the owner) and earn three dollars but I must give a percentage to the concessionaire of 10%, so they earn thirty cents. The concessionaire owns the store where I can then sell my used item. On Edit: We do not use the term: concessionaire. We use owner, store manager, concession or more likely re-sale store owner. Some galleries sell art on concession.
dealer
noun 1. a person or business that buys and sells goods. "a car dealer"
(2. the player who distributes the cards at the start of a game or hand.*) * not useful
A dealer generally has paid for the goods and therefore is the owner of them. They then sell for a profit, that item to a customer.
From my stint in Italy, Concessionaires are owned directly by the Car manufacturers, while dealers are independent Value-Added resellers. The earlier often carry a larger bouquet of services as a result. As observed by many, concessionaire is hardly ever used in daily English, and could be misleading if you were trying to make the distinction I just referred to. Hope this helps. Cheers!