Online retailers selling items they do not keep in stock
Q: Online retailers often sell items that they don’t keep in stock. They conclude the sale and take payment immediately and thereafter acquire the item from the supplier and deliver it to you. Similarly, when hardware stores sell bricks to customers, they conclude the sale and accept payment immediately. Thereafter, they buy the bricks from the supplier and ask the supplier to deliver directly to the customer. Is it permissible to deal in this manner?