Dealers listing coins from other dealers inventory

It happens and it has been mentioned here before but how exactly does it work?
Say I'm dealer A. Do I contact dealer B and ask for a percentage of his coin listed at say $1000 if I can sell it through my site?
When I get a buyer do I notify dealer B to send it to the buyer and pay me my cut?
If the buyer isn't happy or wants to return the coin do I tell him to post it to dealer B or to me so that I can post to dealer B (which would slow down the refund)?
I can see this starting to get complicated if you encounter some buyers that regularly return coins.
Say I'm dealer A. Do I contact dealer B and ask for a percentage of his coin listed at say $1000 if I can sell it through my site?
When I get a buyer do I notify dealer B to send it to the buyer and pay me my cut?
If the buyer isn't happy or wants to return the coin do I tell him to post it to dealer B or to me so that I can post to dealer B (which would slow down the refund)?
I can see this starting to get complicated if you encounter some buyers that regularly return coins.
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Comments
We are assuming both dealers are aware of the other and made an agreement.
If the listing-dealer lists the owner-dealer's coin at a higher price than the owner-dealer does, then the lister-dealer should accept all the sales burdens, like shipping and charge expenses, returns, complaints. The lister-dealer should also make sure the customer is happy. The owner-dealer just owns the coin.
If the listing-dealer is selling it at the same price as the owner-dealer, he must get his profit (if any) from the owner-dealer. This is more of a service to the owner-dealer, so there is no problem in having the owner-dealer finish the sale and give a small fee to the listing dealer (if any).
It is not ethical to list other people's coins without their knowledge.