(1) spread is the difference between the buying price and the selling price.
(2) The smaller the difference between the buying price and the selling price, the smaller the investor's cost. After long-term trading, the spread has a great influence on the overall profit and loss of short-term investors, but has a little influence on medium and long-term investors.
(3) The price difference is the compensation for the risks that market bears have to bear when they exchange customers after crossing their own risk exposure (which may be different prices). The price difference is the difference between the purchase price and the selling price, and it is also the handling fee you pay to the platform. The buying price and selling price will be displayed on the trading software.
2. The reasons for the spread:
Because spot oil has a short-selling mechanism, that is, buying more makes money, buying down also makes money, while stocks, instead of shorting, can only buy up. If spot oil can only buy up, then there is no so-called price difference. The exchange can't give you a platform to make money for no reason. If there is no spread, then the exchange will not lose money. If you bought it at that time, you can sell it immediately. The spread exists only to let people use this loophole to brush surgery. It is also a prevention and control measure of the exchange, and this spread is accumulated over time, like snowballing, so when there is a crisis in the market, its existence also solves this crisis, so it is a bit poor.