Final answer:
In this situation, it is advisable for the seller to disclose the $15,000 discount to the buyer in order to establish transparency and build trust between both parties.
Step-by-step explanation:
In this situation, it would be advisable for the seller to disclose the $15,000 discount to the buyer. When the seller is willing to accept a lower price than the list price, it is essential to inform the buyer about this in order to establish transparency and build trust between both parties. By disclosing the discount, the seller ensures that the buyer has accurate information and can make an informed decision.