Disk prices are low. If you are a seller, you certainly don't want to sell at a low price. Futures delivery is applied by the seller, and the buyer replies (on the member service system of the exchange). The seller felt that the price was too low to sell and did not apply on the member service system. Of course, buyers can't respond, and the shipments are also less. When the general price goes up, you will see the selling of the spot merchants. At that time, the registration volume and delivery volume of warehouse receipts will increase. It's the same as the real scene.