1. Voluntary transaction: The buyers and sellers involved in the transaction decide whether to conduct the transaction voluntarily, and there is no mandatory requirement.

2. Openness and transparency: The quotation information of the transaction should be open and transparent to ensure the fairness of the market and the symmetry of the information.

3. Price priority: During the transaction, the quotations of buyers and sellers will form a process of price competition, which is subject to the price acceptable to both buyers and sellers.