Is the seller obligated to disclose changes in the market price of the good if the good itself remains unchanged?
Chapter on Selling the Musarrah (Animal with milk retained in udder)
Al-Mughni
Book of Sales
Primary text
If the market price increases (ghala), the seller is not obliged to disclose this increase because it is an increase in value. If the market price decreases (rakhasat), Ahmad stated that the seller is not obliged to disclose this either, as the statement of the original cost price remains truthful without disclosure.
Supporting text
There is a potential view that the seller must disclose a decrease in market price, as concealing this might constitute deception (taghrir) if the buyer, knowing the lower market price, would not have agreed to the original price.