This means that the dealer already has a large number of orders. Buy in large quantities at the right time to make the price higher. Then when everyone followed up the high-priced purchase, he threw out all the multiple orders and completed the shipment. But this is easier said than done. There is not much practical operability. In actual combat, it is certain that such an operation will cause losses in all likelihood. Because it can be opened in the futures market. After you pull it up, there is also a banker on the empty side. People can open a lot of space. As a result, the price came down before you threw it out.