原文如下：Clearly, a holder of a call has a better position than the holder of a long position on a futures contract with a futures price equal to the option's exercise price.This advantage, of course ,comes only at a price.请注意，原文是has a better position ，而不是profit,我的理解是价格相同时，期权有更多地选择权，如果价格高于市价，就可不行权，所以处于主动的position
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