Crude oil futures are generally estimated prices, with reference to the trading and spot of crude oil in the future and the market price when futures expire. If the market price is higher than the futures price, it is the price, and if it is lower than the futures price, it is a loss. For example, the futures price is 80 dollars per barrel, the market price is 40 dollars per barrel, and the deficit is 40 dollars per barrel. On the contrary, the futures price is 40 dollars, the spot price is 80 dollars, and the premium per barrel is 40 dollars.