I saw a man buying an expensive item, so is it permissible for me to direct him to another shop that sells it for a lower price?

Question:
He says: Honorable Shaykh, may Allah grant you success, if I see a buyer for an item and its price is high, is it permissible for anyone in the market to direct him to another shop that sells it for much less;

Answer:
As long as he has bought it and taken it, do not interfere. But if he asks you, “Where is the good shop? Where are the good goods?” and you point him to them, there is no harm before he buys.