Well, the price in your question is 1.388, which is problematic. In foreign exchange transactions, five significant figures are generally used to quote, and it is more appropriate to say 1.3880. There are two costs in general transactions, one is the price difference and the other is the commission. The spread is usually 3 to 5 points. If you buy at 1.3880 and the spread is 5 points, you won't make a profit until 1.3885. There is no commission for this. If you have a commission of 50 yuan 1 lot, you can make a profit above 1.3890. Dealers generally earn the difference, and brokers earn commissions!