They bought futures, that is to say, they bought a lot of futures before the price of rubber began to rise, or on the way to the price increase. They can exchange the expired futures for spot, and use the cheap futures rubber to meet the current production demand.

The concept of futures: futures are relative to spot. Futures are the subject matter that is bought and sold now, but will be settled or delivered in the future. This subject matter can be gold, crude oil, agricultural products, financial instruments, financial indicators and other commodities. The delivery date of futures can be one week later, one month later, three months later or even one year later. A contract or agreement to buy or sell futures is called a futures contract. The place where futures are bought and sold is called the futures market. Investors can invest or speculate in futures. Improper speculation on futures, such as short selling stocks, will lead to financial market turmoil.