The balance of securities is 0, which means that you don't have any stocks. The available number is naturally 0, and the profit and loss is 1, which means that you earned 1 yuan in this stock transaction.
What you said about net profit is wrong, because you have to pay the corresponding stamp duty and transaction fee when trading. At present, the stamp duty is changed to unilateral sale of 0. 1%, that is, the purchase is tax-free, and the sale is charged 0.1%; At the same time, we have to pay the transaction fee to the securities company, and it is two-way. We have to pay the transaction costs of buying and selling, which is one of the important sources of income for securities companies.