Because the difference between the selling price and the buying price is the fee that platform vendors or futures markets need to charge, that is, the price difference. However, some places need to pay fees and other fees, and the cost will be higher. It is suggested that you can choose the foreign exchange platform to trade crude oil, which is not only cheap, but also provides leverage of 100 200 400 times, and it can be traded for tens of dollars, which is very cost-effective.