Classification of transaction methods. Trading methods can be divided into the following types from different angles:. (1) According to different commodity trading batches, trading methods can be divided into wholesale trading and retail trading. (2) According to the different trading time of commodities, trading methods can be divided into spot trading, forward contract trading and futures trading. (3) According to the different commodity trading processes, trading methods can be divided into direct trading and indirect trading. Direct transactions are generally direct transactions between producers and consumers. (4) According to the different payment methods of commodity transactions, the transaction methods can be divided into cash transactions and non-cash transactions, and cash transactions are generally transactions conducted by direct payment of cash. (5) According to the change of real right in commodity trading, trading methods can be divided into independent trading and entrusted trading. (6) According to the different degrees of freedom of commodity trading, trading methods can be divided into free trading and compulsory trading.