特殊用法futures trading1.期货贸易margin trading1.保证金交易, 即仅交存一定保证金不支付全部货款的交易marginal trading1.边际贸易option trading1.选购权买卖options trading1.股票预购买卖over-the-counter trading1.场外交易partial state trading1.部分国营贸易ring trading1.垄断交易security trading1.有价证券交易shoestring trading1.小本经营spot trading1.现款现货交易state trading1.国营贸易