22-8 看涨期权的收益支付图 60 Buy a call 绝20 0 0102030405060708090100 Stock price($) -60 执行价格=$5022-8 看涨期权的收益支付图 -20 0 10 20 30 40 50 60 70 80 90 100 -40 20 0 -60 40 60 Stock price ($) Option payoffs ($) Buy a call 执行价格 = $50