I have a grocery store, and some customers force me to sell to them at the lowest price, so I feel that I have treated my customers differently. Is there a sin on me for this?

Question:
I am informing you that I own a grocery store, and some customers force me to sell to them at the lowest prices. When this happens, I feel that I am treating my customers differently. Is there a sin on me in this situation? May Allah reward you with good. I want to raise the price for some people higher than the market price.

Answer:
This is what is forbidden. However, if you sell at the known market price, and some people come to you, and you concede part of the known market price to them, there is no blame on you for that.
What is forbidden is that you deceive people and raise the price higher than the value of the goods. If someone who understands prices comes to you, or someone you are in a good relationship with, or someone you are shy of, and you sell to them at the known price, or lower the known price for them, this is forbidden; because this is a form of deception. However, if you sell at the known price, and the goods do not actually equal that price in the market, but some people come to you, and you lower the known price for them, this is a concession of part of your right, and there is nothing wrong with it. Yes. May Allah reward you with good, and may Allah reward you.