对于看涨期权买方(左图)而言,首先需要支付权利金,因此一开始的收益为 -C。当标的资产的价格低于行权价(S<K)时,买方不会选择行权,因为他可以在现货市场上以更低的价格购买到标的资产。而当标的资产价格高于行权价时(S>K),期权买方便会选择行权,因为他可以通过行权,以行权价 K 低价买入标的资产,并立即在现货市场以 S 的价格卖出,从而获利。当市场价格涨幅较小(K<S<K+C),看涨期权的买方在现货市场的获利尚不足以弥补权利金;而当市场价格涨幅较大(S>K+C),买方在现货市场的获利便超会过权利金。
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