Spot crude oil price difference is the difference between buying price and selling price, which is inherent in the market maker trading system. Spot crude oil is an electronic investment product of market maker trading system. The trading parties of the market maker trading system are investors and trading platforms, just like customers and shops. There is a difference between the selling price of the store and the recycling price.

Generally speaking, it is a fixed fee charged by others. Because the spot trading of crude oil follows the principle of market maker, the so-called market maker means that each investor's counterparty is an exchange. In this process, when the price of crude oil is 10. The price you sold to the exchange was 9.95, and the price when you bought it from the exchange was 10.05. Between buying and selling this, the exchange virtually earned your difference.