Buying futures but not selling means that investors will buy futures contracts when they are bearish on a contract. Buying futures but not selling means that when investors are bearish on a contract, they will buy futures contracts but will not sell them. Buying: refers to investors buying a futures contract, expecting it to rise, and then waiting for it to fall. Selling: refers to the direction of the transaction is selling, and the empty order of the first-hand futures contract is obtained through selling and opening positions.