Is there a limit on profit when selling?

“There are no restrictions in Shari’ah on the amount of profit one may make in a business. The seller may make any amount of profits he wishes to as long as the buyer agrees to the price.”

“If the sale items and commodities that one is dealing in are regarded among the necessities of life (e.g. bread, milk, vegetables and other food items, etc.) and they are easily available to the common person in the place which one is residing in, then one may sell one’s items at any price one wishes, even though one’s price …”