The ruling on increasing the price of a commodity for someone who does not intend to buy it

Question:
May Allah reward you. This questioner, Abu 'Adil, says: I have a real estate sales office. Is it permissible for me to increase the price above the agreed sale price with the seller's consent, without informing the buyer of the increase?

Answer:
It is not permissible to increase the price except through bargaining. It is the customers who increase the price. As for you, you are merely an intermediary, so you do not have the right to deceive the customer. You only offer it for sale to whoever increases the price. The customers are the ones who increase it. As for you, you do not increase it, unless you want to buy it yourself. If you want to buy it, then you inform its owner and increase the price at the end of the bargaining. If its owner is pleased, there is no harm. Yes.