NO.PZ202212300200003401
问题如下：
Given the information in Exhibit 1, the minimum cost of implementing abullish seagull strategy, using strike prices of $490 and $530, is closest to:
选项：
A.
$16.83
B.
$22.47
C.
$23.63
解释：
Correct Answer: A
A bullish seagullstrategy involves a bull call spread (debit call spread) and the sale of an OTMput.
The three positions involve:
Buying an in-the-money(ITM) call at strike $490 by paying a premium $23.05
Selling an OTM call atstrike $530 by receiving a premium $3.40
Selling an OTM put atstrike $490 by receiving a premium $2.82
Cost of bullish seagullstrategy is $23.05 – $3.40 – $2.82 = $16.83
先不管是bullish还是bearish, 有一个疑问，上课的时候老师说过, seagull的头寸应该是4条腿，是＝long stock+long put＋short call+short put,就算题目变成bullish seagull, 也应该是4条腿组成，为什么解析里面不考虑stock那条腿的头寸？
另外一个问题，计算时为什么只考虑期权费，不考虑其他的，比如下图，波浪线划出来的为什么不计算进去。我发现不止这一题，有些题目是要考虑波浪线的，有些题只加减期权费，又有些题只加减波浪线不管期权费，这个可以请老师区分下哪种情况用哪种计算方式吗？
