衍生品的利润率较大，特别是有自己的结算所。
Margins are bigger in derivatives, especially for those with their own clearing houses.
除了实际交易量外，另一个衡量利润的关键指标是未平仓的程度，或在一个给定的交易期间内未结算的衍生品合约的数量。
A key metric for gauging interest besides actual volumes traded is the degree of open interest, or the number of derivative contracts that are not settled during a given trading period.
大部分期货交易者都不会等太久，它们会提前把期货卖掉，利润和亏损都是用现金结算的。
Most futures traders do not wait and close out their contracts early, settling profits and losses in cash.
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